I would be fully against any way to artificially level jump, if only because having such a feature would make it very obvious that something is inherently wrong with the leveling system as is (and that the devs would choose to implement a 'convenience' option instead of improving it directly).

A main story skip/summary is probably something that's needed however. Some ARR quests, particularly the Lv. 50 series, could have some of the fetch-questy parts gutted out. Especially if you're like 5+ levels above the recommended level to do the quests in the first place (3+ at 50).