Part of me feels psionics are dead. Too many people have too many preconceptions based on their favourite type of psionics and each group wants their own vision to be the way it's done in 5e. The designers have already had some great ideas that fell flat, mystic disciplines were cool, so was the psi die, unfortunately neither made it.
If I was going to rate my favourite psi systems I'd go 2e, 4e, then far lower 3e. I'd be happy with either of the two systems they've shown us (not happening) or a system based on 4e using the 5e monk as a base. Why monk? Ki points could easily sub in for a pool of psi points that boost a psion's at-will powers allowing them to keep the psionic feel with at-wills while occasionally boosting them with psi points. I don't think I'd like to see just another spellcaster that happens to use spell points, I'd find be a little boring, I'm sure others would love it which goes back to everyone having a favourite edition for psionics.