Will I ever be able to create the new jobs I missed out on?

Yes, you will. KMS used to be a solid indicator until they switched jobs around but as I see it the order would be:

Mihile (Did he get Hypers yet?) > Cannon Shooter/DS > DA (New class, spin-off of DS) > Xenon (All classes available, Unlimited update) > Thunder Breaker revamp (Thunder Breaker) > Wind Archer revamp (Wind Archer) and the latest one at KMST is Phantom and Mercedes.

Basically, you'd be advised to get all your link skill classes at Unlimited.

Edit: One more thing. If you're looking for Kanna and Hayato as link skill classes they're available until April 2nd IIRC.