technically a classic server would be 50 cap, because it wasnt 75 until some time after rise of the zilart came out.

But no thanks. It wouldn't work well for this game because of how absurdly grindy it is compared to any other MMO, even classic WoW, and its just not famous enough. And I like the current game and wouldn't want even a small number of players to be taken from it. Besides, it was the community aspect that made the game more fun than it probably should have been, swapping stories and stuff in your 6 man EXP parties (something that basically no MMO has anymore) while you beat up on crab after crab and mandy after mandy. Unless it was massively successful beyond your wildest dreams, that community aspect just wouldn't be restored. Plus we've all beaten all the content before so it wouldn't be the same.

Funny enough in WoW classic there's a shocking number of people turbo burning through the content as fast as possible, not realizing it's not going to get any further updates once they reach the patch before burning crusade. So it's going to be a novelty that will wear off once it stagnates.