I really hope they do not add such a feature for multiple reasons from potentially adding P2W in a game that SE said they never wanted P2W to be a part of, will be detrimental to the social aspect of this game where by most people make friends along the way during that leveling process while the new ones who use such a feature are unlikely to do so plus it will make the problem of people not knowing how to play currently a million times worse, if think the complaining about bad players is bad now...after such a feature the current complaints on that issue will be just a drop in the ocean compared to after.
If they do introduce it then it should be unusable past level 30 due to the amount of skills being dumped on people and additional mechanics which start being introduced around that level beyond the most basic of tank and spank which is what pre-30 is generally like. SE please do not add such a feature to this game, listen to the overwhelmingly huge proportion of negative comments about this issue here compared to the few people in favor. This is not something a large amount of your players here are saying they want in this game.
It will damage the game just to please a few people who are too lazy to put in the effort to level up like everyone else has had to do, everyone else who learned how to play through that leveling process and made new friends along the way through those growing pains, trials and tribulations. Sure there may be some players who still can't play well or adequately at 60 even after leveling up as normal but it would be a million times worse if added such a P2W style level skip potion. Instead of adding such a horrible thing like a level skip potion, just trim the quests in such a way that people still need to do them but doing them takes less time...for example if a quest asked you to fetch 20 of something, lower it to 5 of the item or move the NPC's closer together for that quest etc.