Good story!! You are definitely right, the Expos saga is like that annoying relative who keeps coming back. I don't understand why it has taken so long, except for the fact that Selig is involved. The whole story is a mess!
I think that Las Vegas would be the best bet to support the team, money wise and with the fan base, but I don't think that professional sports will ever exist in Las Vegas, it just won't happen. Too many temptations and we all know how ball players deal with those.... And with the type of person Angelos is, I don't think he will allow them in DC even with a balloon payment for allowing it.
My guess? They will end up in San Juan,
PR and the announcement will come somewhere within the timing of the announcement of the USA being involved in the World Cup for baseball (after they decide to drug test all MLB involved in it). This will be Bud's way of 'expanding the game'.