I don't think this is wise.
There's two things at issue:
3 Jobs are level 30, and require the HW expansion in their own Guild buildings.
2 Jobs are level 50, and for some dang reason they put the starting NPC's for both in Ul'dah. While the storyline starters make sense to have them somewhere, RDM did not have to start in Ul'dah, it could have started in Limsa Lominsa. SAM was setup with a coliseum battle, but didn't need to either.
The jobs would need to all be re-tooled to start at level 1, and the corresponding storylines. Because of the presence of PotD, basically nobody bothers with the job storyline until AFTER they've gotten to level 50. I've seen plenty of level 60+ Gladiators, Marauders,Arcanists and Conjurers in as sole class in PotD for whatever reason.
Since most of the jobs don't actually exist until level 30, you're just playing the precursor classes, and especially with Arcanist, you don't really know how these jobs change until then.
It takes about 8 hours, including watching all the cutscenes to get from level 1 to level 15, you can change your class at this point, and you can do POTD at level 17 once you get through the first 3 dungeons. This is also where you get your Retainers, Company Chocobo, and so forth. Basically the game doesn't really start until level 17. At that point you can pretty much change classes at whatever whim you want, and still under the free trial limits.
Most people decide if they are going to play a game by maximizing what the free-trial offers them. If someone only has one hour per day, and it's a 14 day free trial, that is still something that they can hit. SE removed the 14 day limit months ago http://na.finalfantasyxiv.com/lodest...1a05669dcdadae
On the other hand many MMORPG's are freemium games, and you generally hit a brick wall without spending money very early on in the game, and are nagged to spend money at every opportunity.
Many companies built crappy Freemium games because a fool and their money is soon parted. So comparing FFXIV to any subscription title (which is pretty much just WoW) is the only fair comparison. A Bunch of MMORPG's came out, failed or floundered and switched to freemium or were canceled early or before they even went to release. This is going to keep happening as long as everyone is stuck in the Fantasy-is-cheap-and-easy box. You're basically asking customers which versions of humans, elves and dwarves they want.