Harper is going to make the Hall. He's already at 50 bWAR and 51 fWAR, and he's signed for seven more years after this one - he'd have to be pretty much completely incapable of playing for almost all of that to miss at this point. 55 WAR and 400 HR is an extremely conservative estimate, and with two MVPs and some of his career highlights and hype, he would make the Hall on those numbers (and I suspect it'd be on the first ballot.)
Jose Ramirez doesn't have the two MVP and being a mega star parts to fall back on, so he can't limp over the finish line, but I do think he's 80%+ to make it to the Hall now. He's also right around 50 WAR in both systems - ironic considering he and Harper are only about a month apart in age. He's working on his 4th consecutive season of 150+ games and 5+ WAR, so there's no real reason to think he'll turn into a crippled mess anytime soon. He seems very likely wind up with 60+ WAR (my personal expectation would be somewhere in the 65-75 range) with something like 2200 hits and 375 HRs. Where he lands in that range (and any future postseason success) will affect if he makes it in on the 1st ballot or the 8th, but I'm very confident he will eventually get in on the BBWAA ballot.
They're extremely different collector beasts - Harper has a real shot at 500 HRs and has the two MVP trophies, which are career highlights that are going to be impossible for Ramirez to match unless he he somehow gets consecutive WS MVP trophies or something. Ramirez is obviously way cheaper than Harper at this point, but there's just not a likely impetus for that to change.
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