For me, there are only two deal-breaker elements there that make it absolutely disqualified from being a psion:
1) The components
2) Charisma instead of Intelligence as their casting ability
Due to the way 5e works, and the fact that sorcerers get their subclass at 1st level, they could make a sorcerer subclass that says, "your spells don't require verbal, somatic, or material componets" right at 1st level. It would be trickier to say, "Your spellcasting ability uses Intelligence rather than Charisma", since subclasses only add features to the base class, they never replace them. Perhaps the feature could be "When you cast a spell, you can choose to use Intelligence rather than Charisma as your spellcasting ability", but I'm not comfortable with Charisma even being an option, and you just can't remove it in 5e design parameters. Perhaps they could make it so that you are incentivized for using Intelligence rather than Charisma. "When you cast a spell, you can choose to use Intelligence rather than Charisma as your spellcasting ability. Starting at 2nd level, when you do so you regain sorcery points equal to half the level of the spell slot used (minimum 1)." Or something cool like that.
There are plenty of other elements I would like to see in a psion (some quite strongly), but those are the only real deal-breakers in the Psionic Soul Sorcerer. There are a lot of different opinions, and some other people would require more changes for it not to be a deal-breaker, but I think you might be surprised how many people's only true deal-breakers are the same as mine.