Segwit is DEAD!
You are right, with current settings about consensus, SegWit has (unfortunately?) no chance to come to life.
The system will continue to work with the current rules fine. There is currently no show stopper bug that makes changes mandatory.
I feel like the devs should have somehow enforced this (with the risk of ETH fiasco, I know).
No. If you don't like what some miners are doing, don't relay their new blocks. It's up to you, not the developers!