On the bypassing cites aspect, and I'm pretty sure I've told this tale before, but I sure can't remember where I read it, and if true, should give you some pause as to what you believe about WWII happened so much that way.
As good as it may sound that bypassing cities sped up advances, as we know cases where that was the case (Barbarossa and so forth), part of the problem with the Allies doing it in the West, was, that if this man were right (sorry can't even remember the man - maybe it was Galland) that was exactly the trap the Germans were setting for them.
It does sound pretty plausible, and naturally, if true, those embarassed by it would likely cover it up, while if not true was said to make something out of a seeming mess after the fact.
The idea was this, that the Germans deliberately manned ports with great strength (great strength meaning that there was enough strength to hold them for extended periods of time) so the Allies wouldn't take them. Now, I'm telling you this may just have been somebody making this story to fit the facts of what was taken, but he said that the offensive in the Ardennes was Hitler's long dreamed goal of taking the West back. IOW, the holding of the ports was to deny the Allies fuel as best possible (though the man who said this mourned that they didn't Cherbourg better, though I think they destroyed the harbor to be inoperable for a good while), while the Ardenne offensive was to drive them to the sea (I got the impression that the Ardennes offensive was something thought about before 6/6/44). Naturally this plan, if there was one, had to be adapted to the circumstances, such that the later stated goal was Antwerp, but even so, it does make a little sense as to why Hitler would attack with a seemingly pretty impossible goal of Antwerp, when he was likely thinking all along that his plan to win the West had to keep having smaller goals. It's interesting to contrast Hitler's clinging to getting and holding the Bulge, while the last big offensive in the East at Kursk was actually a withdrawal ordered by Hitler IIRC (not that the battle was a withdrawal, but that he didn't hold to the last man sort of thing).
In any event, though it's long stated that bypassing cities speeds offensives, as though that's good, remember, planned or not, if the Allies are low on fuel, and certainly they were to some extent, and on Germany's border, and for the Germans hopefully 'they' would have more fuel, it's almost a brilliant plan. The psychological damage to the Allies would've been immense had it succeeded. Think about something else. What do you do to someone you can't reach, assuming Hitler believes he couldn't invade London any longer? You let them come to you, to get them where you can get them. Of course that would do nothing to stop the bomber offensive, but if you could pull off the Ardennes offensive having such an immense impact, be that when it happened or earlier, the Western Allies might've pretty much lost their appetite to fight, or in any case, I think the more likely, reinforced the efforts in Italy or actually managing somehow to join up with the USSR in an Eastern attack. To think of it that way, it sort of makes the idea of throwing the Allies into the sea somewhat superfluous, but, then again, it might be enough to at least keep that front from having to be manned with very much.
As far as political considerations for such a plan succeeding, the USA would only sue for peace if the losses fell into the Vietnam sort of thing, where the government might stop backing it for people becoming unruly. If what I heard from another forgotten source is true, as well, that had the Brits had the V weapons been raining down for another 1-3 monthes, would've definitely surrendered, needless to say getting forced again off the continent would be worse still (for one thing the V weapons would resume firing).
This sort of thing fascinates me, but how timely the Allied victory was. With the Germans really coming into some advanced design, and given more breaks to their direction, say more fuel for example, what a hell it could've been if the war lasted another 6 monthes, but especially if it lasted another year. Of course, maybe had that happened, even the successful Ardennes offensive for that matter ocurring too, how much more incentive the Allies might've had for getting weapons which might've have only been thought up if things had gone that bad. Maybe British V weapons even the score. Maybe the Allies make the 10 Hamburg raids that Speer said would've brought about Germany's surrender.
And then, of course, there would be the A-bomb
If the A-bomb was a Japanese vengence weapon, do you waste them on a somewhat resurgent Germany? Do you halt the plans? Do make more than they did?