There was a very similar thread that reached 40+ pages a few months ago calling for things to be made more accessible and modern. Basically, Castanica and Bluenarciss have great ideas to make the game better and more welcoming to new players (regardless of how few there are) and old players alike. Unfortunately, there are lots of confused people on these forums who will accuse you of wanting everything handed to you and tell you that you are going to hell for dumbing down their precious game. There's also the bitter ones who will type entire essays amounting to nothing more than "we had to put up with this X or Y years ago so you have to as well!"
As an old player myself, I've been wanting to level another character for ages (since race changes aren't available), but just the thought of the mountains of gated/mundane content I'd have to redo in order to get caught up to my main is vomit-inducing. We're talking everything from the Chocobo quest, subjob quest, limit breaks, Aby Atma obtainment, VW warps, CoP, RoZ, WotG, ToAU, fame building, advanced job unlocking, Dynamis boss wins, coffer hunting for AF, etc, to getting all the WKR wins again.
Even without the need to farm for gil like an actual new player, or the need to meet new people and establish myself on my server, or the need to learn how all the arcane systems like FoV and RoE work in the game, I would never level another character because of the way old content has been handled, or not handled as it were. Changes to old content definitely need to be made, and accessibility is the key word.