Good points and ones that are difficult to deal with on these forums without upsetting some or all of the sponsors and, consequently, Andy. And you don't want to do that do you?
I've had dealings with Birketts on behalf of a friend and I concur with the other posters. So I doubt you'll have a problem there but it does make sense for the agency to pass to MRS now that Scorpa are owned by Sherco,
In the last few years we've seen Scorpa go to the wall and be bought out by Sherco and we've seen the introduction of three new brands viz: Xispa/XPA, Ossa and, now, Jotagas. I doubt the market can support more than three or 4 vendors especially in these tight times. I think many will agree with (especially Dabster).
So I'd not be worrying about Birks but about Scorpa proper.