The last time I remember Yoshida speaking about it he said "the feedback isn’t far from their expectations.”
Source
And that was before they added the major improvements when raising the cap to 60/70.
I think there is a lot of interest for blue mage. The thing is...there is just nothing to do with it.
As someone said earlier, it is meant as a mini-game, like Fishing. Once your log is completed, you don't play it anymore.
I said it already, but if they somehow find a way to add a BLU roulette, I would probably play BLU regularly.
Another major difference compared to fisher is the patch cycle. We get new fish every patch. But we get new BLU content once a year...
That's a real bummer, and that's also why I expected to get a new limited job in each expansion, so that they could eventually give us something new for one of the limited job on a more regular basis.