No, it wouldn't. Vegas audiences are already drunk and/or full from their giant steak dinners; don't make them try to decipher accents too!
I say this as someone who used to live in California and saw Phantom three or four times and Jersey Boys maybe a dozen. It's fun there, but the audiences aren't going to see a Broadway show on the Strip and expect to think too hard. Sure, locals at the Cashman maybe, but not the Strip.
"This thread reads like a series of White House memos." — Mister Matt