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.
One could argue that kanna is, in fact, not the problem and that the problem is actually people feeling entitled to a rate of progression faster than what would otherwise be possible.