Merrifield has been bad for three years, not two months. OPS+ of 93, 82, and 94. Was good for about 1/3 of the 2022 and 50% of 2023, with the bad stretches resulting in the numbers above.
That's okay for a versatile, defensively plus bench player, but he's also been a minus player defensively for the last two seasons, and the Phillies don't seem equipped or interested in taking advantage of either his versatility or his best position.
If he does what he has allegedly been brought here to do (two starts a week) and does it decently he'll merely be a little overpaid. If he disproves the haters or is forced to play more due to injury, he'll be worth it. But there should not be any decisions being made based on the idea of him playing regularly in LF, nor should his salary or brand name dictate that.
Fortunately, I don't think there will be. If Rojas sticks (still likely) it's status quo and if he doesn't you still see Pache and LH OF more too.
I still think they might just keep Pache instead of Cave even with Rojas, at least for a while. There might be all of four times in three months where you need a LHB to hit for Rojas (they wouldn't hit for Bohm or Castellanos or JT) and that PH might get one hit. Rojas himself, or Sosa, or even Stubbs if they would use him, could do that too. And if Merrifield is actually good, he can hit RHP as well or better than Cave or Dahl (I don't know that he is, but that's the premise he was signed on).