Really, & totally end-user complete... I think not, it'll be very much "tinkerer territory"...
As I said, Ubuntu themselves have said they're targeting low-end (initially) for their smartphone(s).
Ubuntu on Nexus (or other top-ends) is not for Joe Bloggs the avg phone user, it's about attracting/leveraging the Android dev community.
Which I'm the 1st to admit is a very good way to go, why on earth Jolla aren't going for a similar approach, is beyond me.
Perhaps it has something to do with the different models they're planning for Sailfish_Alliance, maybe it wouldn't work going that route.