I think you're confusing them "not surviving" with them being fired by MLSE.
I'd also note that none of those people have been recently MLS players or staff. That model is working at EVERY OTHER TEAM doing well. The only two exceptions, LA and Seattle, have lifelong MLS winning coaches at their helm.
There has never been a case in this league where going outside proved to be the smart move. Hudson, Zambrano, Yallop -- every one of these guys had U.S. Soccer ties from their playing days.
In fact, the only guy without a U.S. soccer background to win the cup is Gary Smith... and he was a scout for Arsenal who was brought in, like Vanney, to setup Colorado's youth program.
For once, let's do what everyone else does. Let's not try to get someone "better" from a higher league. It has never worked before, it has led to disastrous turnover after disastrous turnover. Enough. A little Einstein logic, please. Let's stop repeating what doesn't work.