I don't think he'll be top 3 already next year. Derrick Rose, Chris Paul, Tony Parker, Russell Westbrook. . . then you have guys who are arguably better still: Rajon Rondo, Stephen Curry, Deron Williams (if he ever gets his together again). Irving is as close to being #8 as he is #3.
Rose and Paul will definitely be better. Statistically, Irving will be similar to or worse than Westbrook and Curry, yet on a fail team unlike them (which means less relevant stats). Meanwhile Deron has as much potential as Irving and Rondo is better than Irving in every area but scoring when healthy. I'm not ready to call Irving a top 3 guy as soon as a year from now. . .I don't see him improving that much that fast.
I don't think Irving can be top 3 unless some of the older PGs (Paul, Parker, Williams) diminish with age. He scores, but it's on a loser. I don't view it the same as D. Rose getting 25/game on a #1 seed. That's much more impressive imo.