I also remember Yoshi-P clearly stating that improved physics won't be part of 7.0. I think it was when they first announced the graphics upgrade.
It's clearly doable (everything is), but it'll probably make some players' rigs incompatible, and probably make the PS4 version kick the bucket (but I'd be surprised that SE keeps the PS4 version after Dawntrail).
There's basically two ways of doing this :
- Softbody physics with colliders: it's less realistic, but pretty fast. The game probably already uses this to some extent. Having more realistic hair and cloth physics imply reworking all colliders and bones (and vertex weights) on each and every armour and haircut (and mulitply that for each available body type in the game).
- Per-vertex physics simulation: very realistic, but super slow. It can probably be GPU-accelerated, but it'll be very expensive anyway. I don't think implementing this in an MMO is a very good idea (yet).
I don't know of any other real-time physics systems that could be used for hair apart from these.

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