Long thread but I wanted to add my voice to it, for whatever difference it will make.
Have you ever played a game where the only areas with any population were the places with content for the top 5 levels, and where the rest of the world was a barren wasteland, where you'd almost never see another living soul?
I have, and it sucks. It's even worse when you're trying to level up in such a game.
That's the problem with allowing people to skip stuff. At first, people do it to "catch up with their friends" which I get. I hate being behind my friends like everyone else. Later on though, bypassing content becomes an unofficial requirement of any new player. "If you want to enjoy this game (that is, if you want to play with other people), you have to be at max level." If you want to try to level up the old way, prepare yourself for a long and lonely road.
Take Mor Dhona and the three starting cities. Prior to Heavensward, these places were packed - honestly, overcrowded on my server. After Heavensward, all the people moved to Idyllshire, but there's still healthy populations in the starter cities and Mor Dhona. While some of this is due to things like seasonal events or GC turn ins that bring people back, a lot of it is simply that new players still have to spend time in these places.
When Stormsblood releases, presumably we'll get a new hub, somewhere over by Ala Mhigo, and Idyllshire will become like Mor Dhona is today. That's fine. What's not fine though would be teleporting to Idyllshire and being the only person in the zone, except for that one gil spammer hanging out by the aetheryte.
This is the reason I don't like this change - it has nothing to do with the mechanics of it and everything to do with human behavior. The ostensible goal of this is to make it easier for new players to join the fun with their friends but in my experience, while it may not be so bad initially, eventually the cost of the jump potion will become an additional barrier to entry for new players, because they'll "have" to have it in order to enjoy any social aspects of the game, and at the same time, it will become an immersion breaker for players who care about the integrity of the game world - though I realize those kinds of players are probably already a minority.
To be honest, I'm not really even that opposed to the leveling jump potion. If someone wants to power to 50/60 without learning how to function in a group there are ways to do it today, so the level potions wouldn't really result in any more bad players than we already have. And truthfully, experience is ridiculous pre-50. People make it out to be a grind but if you do the story quests and only some of the side quests along the way you will be over-level for nearly the entire time. My other character was 60 before she even set foot in Heavensward, simply because I took the time to do the ARR relic on her - and that was without any of the various experience boosts that you can get. Experience to level on your first job is not, and has never been a real issue. On 2nd/3rd/4th jobs? Yeah ok. Maybe a little.
But the story potion I'm opposed to, because it means that first the ARR areas, and later the HW areas, start to die off completely. Maybe it will take a year or two before it's really noticeable, but once things start down that road, they really can't stop.