Let's avoid restructuring entire classes, changing party compositions for existing content, and greatly changing the mechanics of a fight(s).
No!

But seriously, on yours, I like the VIT idea... It would at least make ... less informed people... understand the usefulness of tank DPS in situations where high HP wasn't required, through forcing it on them . your Spell speed/Skill speed ideas are something I thought were nice and thought of too... Higher Skill/spell Speed can as a bonus grant higher resource regeneration rate, balancing it out. This would be especially nice for SMN :X. Now, IDK if I can make mine... short... or simple.. but I'll try.


Problem: Open world is beautiful, but so very little reason to explore.
Solution: More stuff like the Elixir vase NPC. Reward exploration. (Perhaps similar to GW2 open world chests)

Problem: Achievement points - Useless. (Though certain achievements giving items = Good design)
Solution: Achievement point currency, similar to GW2.

Problem: Hunting logs are an awesome concept but are one and done deals which sucks.
Solution: Re-doable once a day for the Exp rewards.

Problem: Contagion required for any realistic sustained SMN DPS
Solution: Make it a SMN ability, not a pets. Replace Garudas Contagion with a spell speed buff for Garuda.

Problem: Ifrit has Blaze Spikes... Why...
Solution: Replace Blaze spikes with either Enfire or Skill Speed+ ability for himself.

I have plenty of solutions to problems, but really, none of them are simple or easy... or quick... but yah.