As it appears this is happening, here are the Rt rates for the states two months ago and now. While mortality projections are currently low, if cases rise, those will rise also. If Rt is above one, mobility and social interaction is increased, cases will continue to rise. The same Imperial study projected only about 16% of New Yorkers have had Covid (with error margins from 11-25% IIRC). If the hardest hit state has only 25% with some antibody protection (and how much is still unknown) it's going to take a long time for herd immunity to occur anywhere.
The IHME now uses several factors to predict better and worse scenarios based on some measures in place, mask wearing, etc. They also have stopped using published tested numbers and only use projected cases now, which are 5-10x higher than actual published case increases it seems.
Mask wearing is the one thing everyone can do at little cost to themselves that will both help them and everyone else reduce spread. Will they do it?
