apples and oranges...
I don't think they are comparable festivals these days, Boomtown's whole thing is the immersive sets and storytelling, so it should be the leader in creativity. Glastonbury is many more things and vastly more diverse.
Can't see any major changes happening before the fallow year, especially footprint changes. Finding a way of keeping a clear walkway through the back of the stages would be welcomed! It's been a pretty tight squeeze through there the last couple of years!