Good luck with that. The bitcoin core folks can't even agree to change blocksizes to increase transaction throughput. Switching to PoS is highly unlikely.
Further, whether or not some folks move to ethereum is more or less irrelevant to whether BTC carries on doing what it's doing. The problem is not individuals making the switch, it's getting enough people to switch in order to reduce the energy footprint of BTC.
The other big change on the way is a massive increase in scalability, which I'm hoping will help move the market in a more sustainable direction.