The decline begins... Square Enix, heed my call.

[Sunarie]

I honestly would like to see them extend the amount of experience it takes to get from 1-50 (I want the time it takes to level to be longer), but add in various ways in which to get that exp.

I would love to see people leveling via dungeons, side quests, leves, guildhests, and fates. Currently, there isn't enough end game content to really hold players attention for several months while new stuff comes out. So making it easier to 50 is just going to result in more problems later on. Making it beneficial in some way for level 50s to do lower end dungeons will take care of some of that, major thumbs up for that suggestion, but you still have the myth tome grind at the end of the day, so I think people would still spam AK and WP for the time being. Those focusing on Darklight only (maybe after myth cap) may queue for some of the lower end stuff though.

Going strictly by what I see in my FC, people are starting to only log on to meet caps and wait for raid days. The ones trying to level different classes often complain about being so bored of fates. A few people have already quit. Lower end dungeon queue times take ages, sometimes even while waiting on dps of all things.

I really do like most of your selections, my only complaint would be that I don't want to make the time to get to max level shorter. So that longer, with the variety you suggested would work wonders for alt leveling.