In that case, why have proof of stake at all? Wouldn't it be simpler to just have the set of oracles alone facilitate the currency, since they already effectively have the power to?
Further, there's also more resiliency. If the oracles somehow broke or conspired and all said everyone did zero work, the network would still run. Now granted it would not be great that only previously pending research and PoS rewards would be given out, but you could still send coins, run polls, etc.
[1] https://main.gridcoinstats.eu/address/ (excluding the very largest one (the foundation) because it's multisig and can't stake. In its case it would take 1000 days to reach)
The market does tolerate that now
Today you wouldnt use a new blockchain you would just issue an erc20 token with an oracle server having an admin key for distribution. You could have people merkle mine to accumulate a stake, but this is primarily to keep the “crypto/computational” branding for that audience, as the oracle aspect would still be centralized