An option for characters to start at level 50, pre-heavensward, for FREE

[Driavna]

It would also severely limit the scope of the MSQ. Hard to tell a greater story when you are limited to a very episodic, self-contained, villain of the week format.

You don't need to do that. MSQ can work just the same as today and have the same scope, some minor changes to avoid revisiting old areas is all the needed compromise but don't take the word "independent" literally. The difference is: once you hit level X you can move to the next if you want.

Anyway, I'm pretty sure is never going to happen and at some point, expansions will just come with a skip potion.