JMS Big Bang Tespia Open For All (?)

I know I kind of quitted my Bishop, but I still don't understand the fuss about Ultimates? Unless lukless builds are screwed?

Bishops and AMs today mostly train by spamming their 1- or 2-hitting ultimates at skeles. This is what enables them to be the fastest levellers in 4th job, and to sell leech to fund their potion use and more.
If ultimates get a cooldown, they can no longer be used continuously, and mages will have to find new training methods using new skills (or old skills that have been strengthened in BB). They will likely no longer be able to level so much faster than every other class, nor sell leech. So they'll need to find new ways of funding.
The Archmage playstyle will change drastically and become more like that of physical classes: train by killing monsters few by few, taking several hits to do it; make money by bossing (which they will be able to do effectively) and merching.

Naturally, many people who chose a magician job because they liked the archmage playstyle are not happy about these changes.