I think it puts pressure on both Tampa and Montreal to get new ballparks built.
The Rays are a contender, probably playoff bound. If you had to share a team, that would be a good one. But they're locked into a "use agreement" in St. Petersburg through 2027. One of the Washington groups checked it out (before the Nats arrived) and it's pretty well ironclad.
If this happens, I don't think it's going to happen right away.