Yes, i would be very disappointed, especially since i like both jobs and would like to see them both full-fledged jobs, and this i think is just the start of many problems this dual class/job system can introduce.
I suppose it's not such a bad idea stemming multiple jobs from one class, atleast that may solve some of these dilemmas.
If SE is really going to go through the trouble of creating one to one class/job pair, they may just be putting more on their plate than they can handle. I would honestly rather they just focus on getting jobs out and stop wasting time on classes. Jobs can be easily tweaked to handle solo/diversity more efficiently which really is the little distinction classes have from jobs atm. That to me sounds like much less work for SE than having to worry about creating classes and jobs together all the time along with specific lore, content, gear, etc for each one of them, not to mention the very possible dissatisfaction from the playerbase when they pull the wrong strings with their class/job decisions.
While i appreciate the idea of trying something new and interesting, in this instance though, I think it's all too confusing, a hassle and a potential can of worms for no good reason.
Bleh.. The Double Edged Sword of Creativity..