ruthlessly, yes, that's what would make sense.
What I would say is, this squad is deeper (not better) than the one he had, and we financially can compete way more than then, so there is some potential for him finding upside in that time. We should also be smarter and try to work with him (and all managers) to improve their abilities over time, add additional coaching (I'd be happy if we kept our set piece coach as example for next manager). I'd also work with him to push on one of the domestic cups, him winning even the league cup would buy a lot of time/favour beyond what he already will get.
But football is a long game (something our previous chairman did understand), having us back at top4/6 for next 5 years, playing attractive football and waiting for that moment (this year, the Leicester year) where the others fudge up, isn't the worse strategy.