It really depends on how he ages from here on out, and aging for catchers isn't the easiest thing.
Realmuto has 31.3 WAR according to BB-R...35th all-time for catchers.
Every catcher over 50 career WAR is in the HOF (or will be once Mauer gets in).
Posey is at 44.8 and Molina at 42.3. If Realmuto can get into that range, he'll be a strong candidate.
Considering he's averaged 4.5 WAR per season for his last 5 full seasons (not counting shortened 2020 season), he's got a shot.
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