But at the same time, do you only allow one single entity to design all planes?  If another entity designs a plane, does that constitute a hostile takeover or a power grab in the aerospace industry?  Surely it's healthier if multiple entities come up with their own designs and then passengers decide which plane they want to board based on their own preference.

As a community, we still can't manage to square the circle that while we think open source software and users having a choice over which implementation they choose to run are good things, at the same time, anyone running or supporting a different implementation isn't a good thing?  It's completely contradictory.

We've clearly moved past the stage of "I think plane A has a superior technical design to plane B" and have now arrived at the "we're going to make everyone use plane A by threatening to change aviation rules to put Plane B out of business" stage, so I can't help but wonder if we still respect market freedom if we're willing to go to such lengths to enforce the status quo.  I'd like to see SegWit activated, but I'd rather it wasn't at the expense of healthy competition.  Moving the goalposts to obtain your goal is almost always considered poor form.