I do think summoner shit will still be more expensive than it was because it comes off after such a strong league and a lot of people who were like "eww summoners" after playing it the past league and seeing how it can melt bosses with no gear and pretty easy or how it clears pretty decently with spectres will feel like it's a good idea to use a summoner as a starter still. The nerfs are honestly not bad at all. The zombie nerfs I think are over the top IF you don't use a Baron build but with Baron builds the nerfs feel like fucking nothing really, the spectre nerf is the one I'm unsure about I haven't checked if they said when you get the next spectre after 25, is it still 31, is it scaled comparatively(so you basically can't get it anymore), not sure. Regardless should still be more than fine even with one less spectre. They nerfed movespeed a lot(so much that it makes Ravenous Horde even less appealing than it already was due to its shit position, funny it's the only minion node nerfed on the tree and one I'm sure most people didn't take other than via annointment) and hit Feeding Frenzy a bunch like expected, but I expected a bit more.
That said I don't expect crazy prices other than the top end stuff.