They will, but not by standing firm. No, first will come the backlash, then GM will "listen to its customers" and backtrack on this.
The problem is, I've already as of this morning stopped listening to GM. I sent the link to my wife, and now we're planning which Hyundai/Kia dealer to go to first to look at Ioniq 5s and $(whatever the equivalent Kia is called). Doug in Edmonds says he has 65 of the l'il buggers. We might just drive one home this weekend, at which point GM has not only lost a sale but further convinced me to stay away from GM.
Did I mention that my father worked for GM all his career, and already pre-ordered an EV Blazer, which we said we'd take if he didn't want it at delivery? Yeah, I need to send Dad quick email about that...