A RL FC mate of mine is like that. He benched both his WAR and BLM after hitting 60 with them. SMN and NIN are his current interests, and will likely put them away too at 60 of if another job interests him. Whichever comes first lol. We simply just do what is enjoyable to us while working towards our bigger goals.

I tend to focus on just one job at a time and put all my effort into it. I deviated from that a bit by leveling both SCH and WHM. So progress is slower, but I am perfectly ok with that.