To each his own. I love playing SFV and I also really enjoy watching SFV. But I find SF4 a lot more fun to watch IMO and I don't think that will ever change. The long combos, set play, character specific stuff, wonky hit boxes, and just sheer wackiness made for a infuriating experience but it was a amazing to watch at high level.
A few days ago I decided to watch Daigo vs Momochi GF at stunfest and winners, losers, and grand finals of EVO. Still very fun to to go back and rewatch. I know SFV has a lot more room to grow, with more additional characters, balance changes, and maybe even additional mechanics. But I think they'll keep it more simple and straight forward so that's a big part of the reason why I don't think it'll ever surpass SF4.