I don't know where you read that, but I think you misunderstood. There was an interview where Yoshi-P said he didn't want to raise the level cap too soon, because there are multiple classes to level already and he wants people to use the HL content.

But that doesn't mean he won't ever raise it. On the contrary, he said multiple times that the level cap will be increased, giving new job quests, new skills, etc...

He even said it again recently when asked about news egis based on remaining primals for the summoner.