I have a unique perspective on this, as in - well, I'm a displaced Brewer fan in the East Valley in Arizona. And, as I live in the A's spring home city, I have a somewhat partial rooting interest in this situation.
My number one concern is that the A's would not only abandon Oakland, but Mesa as well - one of only two Cactus League facilities that have "divided" locations. The Giants over in Scottsdale and the A's have stadiums separate from their practice fields.
Of course, if the A's move to Vegas, they might be interested in moving their facility to Legacy USA (fka Bell Bank Park) in the SE part of Mesa - and practically across the street from Phoenix Mesa Gateway. (Did I mention that Gateway has direct flights from Mesa to Las Vegas?)
I do foresee an expansion franchise considering Legacy USA for their spring home, though that may be my selfishness talking.
Anyways, as to the A's themselves - I'm old enough to remember the two times Finley tried to sell the team and move them to Denver. This thing ain't gonna be a clean divorce. Oakland's gonna force them to play at the Coliseum in 2024 by lawsuit, no matter how much money MLB throws at them, and we might be in for another round of what happened when the A's moved to Oakland in the first place - placating jilted cities with expansion teams.
Which, realistically, is what they should have done back in the 60's, tbh. Finley should have just sold the team to KC concerns (Kaufmann, for example), and let Oakland join the AL with Seattle in 1970 or 1971.