People saying they wouldn't want Matic here this summer were probably the same ones shouting and raving about him after his fantastic first full season back at Chelsea, and being absolutely pivotal on the way to their first League Title in 5 years.
One bad season doesn't make a bad player, just as one good one doesnt make a great one.
Good point. You hear similar sentiments about Memphis as well and I'm pretty sure there will be some humble pie about him in the coming years.