I think next season is going to be fascinating from a title-race and top 4 perspective. For the last 4/5 years we've had United languishing due to poor playing style, crap squad and low morale, but now that they're seemingly back to playing attacking football the top 6 suddenly now have a big fish back. City, Liverpool and Spurs aren't going to suddenly start playing terrible football, Chelsea can only get better (and no doubt will, with a new Zidane-shaped coach), and Arsenal are going to become a force if/when Emery gets his own players in that can play his particular style.
I'd only have concerns that Spurs continue to underinvest and some of their top players get picked off by bigger teams, leaving them much weaker, but as of now they're flying with or without Kane.
Basically all the good teams will be even better, they'll all invest heavily and then City will win it on goal difference because of Augeroooooo