What if there was some kind of trial you had to do if you used a jump potion, similar to The Smith's tutorials?
I could definitely see jump potions being an attractive alternative to a new player who wants to do content with friends, but doesn't want to sink a month+ into getting their character through MSQ for that. Older content feels like almost an entirely different game than 3.0 and onward, and even with some efforts to streamline the MSQ a little more, there are periods where it just drags and not a lot of very interesting things happen that may keep some new players interested in continuing their subscription. That stretch of level 50 quests at the end of 2.0 is especially arduous...
I think that'd help a lot, or something like the novice's network, but for intermediates and useful! Like someone that is particularly good with the job that the new player purchased could be rewarded for teaching the purchaser (like gold friend chocobo feathers or something)