He's up there. They are saying both Madrid and Barca are in for him. I think he can do it there then yes.
The term world class gets bandied around far too often on very average players. I think bale is undoubtably talented but to be a world class player you have to perform at the highest level on consistent basis. Given he is welsh then it needs to be a minimum of champions league football as he will lack the platform to test his self internationally. Should he maintain his form at that level then yes you can consider him amongst an elite group.
On the rare occasions he's played Champions League football, he's scared a fair few international defenders to death. Agree he needs to be playing at that level consistently, but when that door has been opened he's tended to perform.