Based on the latest announcement, i think that the spent WP requirements should be increased when/if WP for days are actually implemented. I know as well as all of you that it might be ages away, but solutions never come it too early.
Basically, i think that every requirement already in place should be increased by 3-4, probably in the very high cases up to 6 spent WP, plus some of the tougher spells, like mirror and deadarmy, and the more secret locations, like oak tower, sage's temple and berserker's charge, should go a little deeper in the shop, probably like 1-2 spent WP.
As it is, the shop progress is rather slow, and takes a lot of work. That should stay that way, else people get stuff a little too fast and easy, imo, that spoils them.
Also: Stuff like K docs, Location subtitles and silvertongue should get a limit of at least 8 spent, drachorn mutation like 13-14 spent. I'm very much against giving people such stuff as freebies just for logging in.