That's OP's entire point. It's too soon to start "deprecating critical parts of bitcoin (zeroconf transactions and low transaction fees)".
But it doesn't exist yet. We've no real idea what the incentives or disincentives might be. We don't know whether it'll work in the way it was intended or in any other way. It'll be time to start questioning when we can see live examples and then we'll have a concept of its impact.