There only needs to be a single miner that uses PoW and you can freely move your funds to other wallets. You can even start the miner yourself.
So no, your funds are definitely not lost. You might be the only one connected to the "network" but wasn't this the promise of cryptocurrency decentralization?
well the PoS fork tokens will acquire 99% the value of the current ethereum tokens, so if you want to access that you've got to upgrade your software. You are right tho you'll continue to be able to interact with the PoW network.
