I wouldn't be surprised if they at some point will offer Bitcoin related transactions for a certain fee. You want to send $100 worth of Bitcoin to MrX and MrX can pick up that amount in fiat at Western Union points.
I'm not too sure about that. It seems to me that WU must have relationships with the banking industry in each separate country they operate in. If WU started cutting those business partners out of the deal, there's a strong incentive for the banking lobbyists to get the local politicians to shut WU down in that country. They call 'em banksters for a reason, y'know