Yes.

It's much like a PoS coin but with a lot of coins actually at stake in the case of a "short range" fork.

There is nothing that stops a "long range" fork.  You could let transactions include the last block-hash and measure the economic activity to determine the honest chain, but that's just a heuristic.  The solution is to simply stay in sync with the network.  You are invulnerable to forks as long as you sync with the network periodically.  If the unbonding period is (say) longer than a year, then you just need to sync every year.