He doesn't have to win one the 3 'blue wall' states. He has other paths. It will be much harder, but...the issue is those three states are where they have the best cheating in place.
Biden won NV and AZ last time, Trump is up bigly in both. In fact NV is likely to be called for Trump this weekend. Those two states are 17 EVs, which cancels out either WI (10) or MI (16).
Plus, MN, NM, VA and NH are also in play. Trump claims CO is as well, and pubs continue to extend their EV *lead* in NJ.
We currently have at least 11 swing states. I suspect there are likely about 15 states in play.