personally i was in the same predicament as you (kinda no warlock alt) my mage had tailoring/ enchanting i and i wanted engineering, i decided to give up on enchanting in the end, for 3 main reasions
1) tailoring makes things cheeper with the leg enchant
2) everybody knows a mate/guildy who has enchanting and is willing to do the enchants on the cheep.
3) enchanting is soooo Annoying to lvl each expansion (i know that sounds strange moaning about lving enchanting when im going to replace it with engineering on a toon without mining)

in all honesty enchanting has more of a sinagy between the professions as you dont have to pick between lightweave and springy arcanoweave but i just like tailoring

3 does leave me in a dilemma though when i changed to engineering from ench i had just lvl'd a dk (with mining/eng) so i had tones of spaire mats. I dont know what to do in cata now do i go the cheap root lvl the dk and send my mage the ore or lvl my mage and eat the costs.

i dont think i could live with myself if a dk was my first 85 though

/end wall of txt