One of the things I loved in FFXI was that there was content across all levels. Specifically, in BCNM, you were "lowered" to lvl 30 for some fights, which means you had to have lvl 30 gear to be able to do the content.
I would love if FFXIV introduces middle and lower level content. This would "fix" the issue of 99% of gear being outleveled within a day or two. It's pretty much end game gear and the rest of the gear is useless.
I would love to help friends who are just joining FFXIV if there was compelling, "fun" content throughout. I'm sure crafters would love to be able to craft items across all levels and know there was a purposeful use for them. IT will jolt the economy and making crafting meaningful across all levels.
My 2 cents.