Even in the 24th century reunification was going to be a long, slow process. In the 23rd century it may be nearly impossible to accomplish.
If Vulcans wait for ponn farr they will never rebuild their 'endangered species'! Some traditions may need to change for continued survival.
It's not a tradition but a biological imperative.
But please see above - Vulcans can and do mate (and conceive) at times other than during pon farr.
Moreover, as an especially long lived race, they have many more child bearing years in which to do it -at minimum 2-3 times the number of years of human females.
I think the Vulcans will do just fine. I think the biologically able will be in the mood.
But I don't think they will be in the mood for a raproachment with their "sundered" cousins, The Rommies, or vice versa, just yet (for myriad reasons stated in another thread on the same subject).