Results manager, "guaranteed success", given the right resources available (squad or transfers). If it takes a bit longer here than it's done elsewhere where his resources have been much greater I can't really fault him for that. Though this current rut can't keep going.
If it takes longer though, he still has to go. Take a scenario where over, say, this year and the next 2 seasons we finish 5th-6th (which looks optimistic based on where we are at the moment) with a couple cup finals that still doesnt work given how dull we are. We're painful to watch - there can't be many worse teams in the PL in terms of entertainment and excitement
Unless Jose is going to get you top 4 pretty much immediately, he's not worth the pain