Note that the 2032 EPA guidelines are "technology neutral" - they don't require EVs, just emission standards.
While true, there simply isn't any other developing technology close enough to scaling up that would help with those guidelines in less than 10 years, thus the initial push in the last couple years to build and sell more EVs. Since auto manufacturers are already dropping the rate at which EVs are being manufactured, I'd expect that either the emission standard value would increase if it stays at 2032 or the year that the standard needs to be met will get pushed further into the horizon.
I'm most hopeful for hydrogen being the true ICE replacement, with EVs serving to bridge that gap once enough people realize the practical limitations and environmental issues that sort of scaled manufacturing would be on a global scale, but hydrogen is still several decades away from being an option.