As more hashers migrate to pools like Ocean the FPPS model likely breaks down.

In order to smooth out fee payments the pool needs to retain a stack of bitcoin to pay out during the unlucky periods. As the pool starts to lose market share that stack quickly dwindles and the payout becomes unsustainable. At least in theory.

If a fiat money printer is backing the pool then hypothetically they could buy the coins on the open market and keep the scheme running indefinitely.