It does make sense.
I cannot think of another fighting game with as much content as Ultimate.
74 fighters
103 Stages
900+ Songs
A single player story mode
Fanservice of nearly all games, period, via spirits
Not being on Wii U
Not being on 3DS
It's the perfect storm.
Plus the fact that Smash is way more accessible than any other fighter.
I think this one will rock the charts.
Only thing I think could hurt it is the online which IMO remains sub par.