The current price of ETH is completely unsustainable.
There is not a single dApp that has a huge userbase and I´m also
not seeing the emergence of one in the foreseeable future. Besides, more than 31M $
are rewarded in mining rewards every 24 hours (Bitcoin mining rewards are 17M $ per 24h).
If we assume that most of these get sold
within a month and miners don´t hold the block rewards for the long-term
Ethereum needs fresh capital inflows of ~900M $ just to keep its current
price level.

The switch to PoS keeps getting postponed, which could be an indication
that there are unsolved problems. Besides, it is questionable whether Proof-of-Stake
is even technically viable at all. There is a reason why Satoshi Nakamoto decided to use
Proof-of-Work for Bitcoin.

To sum up, I´d guess that the upside for Ethereum is extremely limited
and it is much more likely that it will eventually fall all the way back to
sub-100 $. I haven´t even taken into account the possibility that a better
smart contract platform emerges or that one of the current competitors
steps up and improves drastically.