Kaleidostone and the general state of Inspiration
It feels more and more like inspiration is just... bad. Kaleidostone is an obvious troll/for fun keystone. It shouldnt ever be strong, due to its rather extreme rng nature. And taking a closer look at inspiration as a whole... The whole tree is just bad for the game. No wonder it needed to get nerfed multiple times.
And in terms of keystones... They are interesting, but do not lead to anything good. Klepto and Glacial lead to really unhealthy gameplay, The concept of spellbook just hasn't been working out well ever. Then we have the lesser runes: Most of them either are rather... weak and/or abused. The few worth keeping you could just as easily slot into any other tree.
Basically: Is there even a point in keeping the tree as it is now? I'd say, take the good from it and put it into other trees. Most of the runes in there a fringe, weird options that only invite abuse or really, really cheap tactics anyway.