On one hand I can understand that someone not interested in story who wants to do endgame may be overwhelmed with the amount of story. At the same time this is after all a Final Fantasy game and we know that in the future we will be able to do this mostly solo too. Maybe this MMO is simply not for everyone and IMO it should not change its main core just because some might not want to play it for the story.
I also dont think that a new starting point would be good for anyone in the long term. Yes we start a new arc with 7.0 but it was already hinted at the end that we will see the Scions again. They basically told us that we should call on them if stuff goes crazy. On top of that we have so many connections with other NPCs, its very hard to imagine that suddenly in 7.0 we dont speak to any of those again. I believe that we will meet new people but that certain other NPCs including someone like Cid will always be a constant through out. People that seemingly would have no connections to a fresh person.
And for any interaction to make sense SE would have to write different scenes with it, increasing the amount of work needed which in turn will probably take away from other content beside the story. On top of that how would it make any sense to unlock old content? Many of the dungeons and trials are locked behind the story. The whole first and its content would not be doable since it would have already happened. At least right now we have the time bubble where everything will always happened at a specific time even if you unlock it later. That cant be true for a new character in 7.0 because for them to start there, everything must have already happened.
And with all of that people that enjoy the game for it story will suffer, because time would be split to make it sense for both sides and those that played it for endgame might suffer because ressources are not endless.
In the end a solution already exists. You can already buy skip potions. Just see it as an investment on not having to pay x amount of sub months. And you give SE more money too. I guess I would also be fine with one free skip for ARR-Stormblood so that you would start with Shadowbringers but other than that, I see no reason to change the system right now.