What will probably be needed to reduce skill bloat is to change the way we get skills.

Take Whm for example and the stone spells. You get stone 1 2 and 3 all seperate from one another. What should happen is for stone 2 and 3 to be changed to traits that replace the previous stone spell. You get high enough and stone 2 replaces stone 1 and the same for stone 3. This would not only fold 3 skills into 1 but free up space.

This could also work for new skills. What happens is you get a trait that replaces an earlier skill with the new one. This would both prevent skill bloat and allow for upgrades of skills without needing to change hotbars too.

I could see both of these happening witj future skills as even tho I play with a g13 which allows me to set up to 36 abilities at once even thats full on me and Ive no room for more. Hell I had to drop a skill from my NIN cos Ive no room for it.