My experience @rcbo is, that people are tribal and need to gather around a term, a brand a togetherness.
So to evade by all means to get stuck just with mastodon and use that effect of "we" I can't see why no create it. Not in a tiresome repetitive hypnotizing fashion, but it's important to point out the distinctive difference.
For me it's like fediVerse is the result of a more than a decade long search and fight for what we have in common, our #commons and that's ultimately the decentralized communication agreement that evolved into activityPub.
I actually can pinPoint you to the evolution of respective hashtags over time and space of about 13 years.
It's a cultural term at this stage I guess.
#federatedWeb #theFederation #fediVerse
federatedWeb -> theFederation -> fediVerse
Even a misspelling 10 years ago shows up, federateWeb with a TV take about #friendica and #diaspora, a comment from @fabrixxm and of course @tobias is all over the place ..
Actually the upcoming #FOSDEM event has a long lasting hashtag stream on geraspora, maybe this is the first fosdem/federatedweb post, including an interview with a #diasporian on #FOSDEM2015.
@_elena