Wands in their current form do seem a bit restrictive but I understand why with the way they redid the number of slots everyone has. I'm thinking we may see some feats come out alongside the Occultist. I can definitely see them being able to modify wands in some way.
What I kind of wish overall is that wands were destroyed due to overclocking, just broken. That way it wouldn't hurt so much to attempt the flat check since you'd be able to repair it later.
Honestly I think they could make a Rod of Many Wands item. It lets you slot in a number of wands into it, which all can be used. The extra cost of the magic item of the Rod offsets the ability to have all the wands "on hand" without having to play hand juggling.
It would also be highly customizable, and higher ITEM versions could allow for more wands within it. (idk. every 3 item levels nets 1 slot or every 4).
Add in a version or some method to use it as a Mace or something. Or more clearly define the rules on improvised weapons, runes, and such.
Now you've got me picturing and craving some sort of six wand revolver/shot gun hybrid.