For it to be worthwhile you'd first have to break players of the "solo everything" mindset they've been in for several years now.
Would also require, on nexon's end of things(the devs, not the publishers; yes there's a difference), reworking the party system so that it doesn't cut exp per kill by almost half just for having a second person in the party and in the same map.
Alishan is a waste of time, really. I can't advise you to continue through it, as it's a buggy mess. I would suggest that you simply stop now and treat the alishan option in the dimensional mirror as a way to quickly get to henesys from any other town.
This much I definitely support. It was lost in transition, more or less, when the mirror UI was updated to its current form and hasn't been back since.
That smells an awful lot like pay-to-win. Good luck convincing anyone this isn't a steaming pile.
Why, with the amount of disdain people have for pay-to-win facets of the game, would you suggest something like this? You know how the majority of players feel about pay-to-win, there's an entire server dedicated to its absence.