As one of the people who would be getting phone calls about all the software that breaks when EST gets redefined to be four hours behind UTC rather than five, I'd really not want to go to there. Either of "EDT is now year-round" or "The east coast of the US is now on AST" would lead to a lot fewer problems, as changes of that nature have to be dealt with pretty regularly.

Shh!

We need the thoughtless people to be on board to get this through!

It's how people would think about it though and it has precedent and mechanisms to implement. (We've changed the dates for DST before, including making it year-round.) Shifting everyone one timezone to the east, by contrast, sounds a lot scarier and would probably be more disruptive.