Everyone will do mech into battlegroup into ostwind spam again, effectively killing all build diversity. As someone who used scavenge both before and after the patch, scavenge is a lot more healthy for the game and interesting to choose in the current patch.
I've used that tactic countless times before as well, to the point I was able to park Ostwinds in opponents bases. It was fun for me at the time, it totally killed the game, and build diversity, i even got flamed at the start of a match if i went full ostwind. I would hate having to return to similar builds and tactics - i'd leave things as it is now, I'd rather have changes to the specialised units themselves to make them more attractive than changing their requirements.