in my opinion the worst thing about this hard fork of ethereum is the fact that it has a very high chance of splitting it into another new altcoin. so in the end after this fork we can end up with 3 ethereum coins.
- the original ethereum with immutability currently called ETC
- the current ethereum fork with PoW which has the miners working on it which may not give up the revenue specially with the ASICs
- the new PoS fork of it

if this happens, since it acts as a free airdrop we may see a big dump right after the fork.