Coming from Project M and being just another "I can play a friend of mine and win" dude, I'll definetly buy Ultimate and wish to make it my new main game. I love the speed of Melee, but there's a few things that bother me about Melee (no inherent Netplay, basically 0 locals where I live, tap jump can't be turned off, too few characters I enjoy personally) that made me play PM mainly over the years.
Since there were lots of Smash 4 events all over Germany I hope to see even more Smash Ultimate hype and go to ALL the locals I can reach.
Smash 4 was always too defensive for me, with airdodge spamming and low combos, but that's again just my opinion, don't mean to discredit the game. As a casual game I thoroughly enjoyed it, and a few dozen rounds of For glory were fun as hell!
Ultimate in itself also just looks like a faster, bigger and better Smash 4 and I can definetly get behind that.