It's a real shame that Eike didn't roll well enough to be talented at Enchanting, as that trait paired with Natural Alchemist could take her interesting places.
That's assuming many of them would do so. There's at most 20 High Mages in Laurelorn, so it's unlikely there's many more Archmages. And they will also be busy making the flowers.
There's freaking 20 archmages at most, while there is likely hundreds of runesmiths. That's hardly comparable. We can more easily find free runesmiths than free Archmages given the disparity, even if some are busy with the reclamation.
Again, freaking 20 archmages.
Demand as well as supply matters. If there are a couple of hundred runesmiths who can theoretically make the storage runes but 90% of them are booked solid making gear for the Silver Road War for the next decade, it adds up to the same throughput.
This is likely to be an extraordinarily busy time for a group whose baseline is to to have no free capacity.
To illustrate, look at it from the Thorgrim Negaverse's point of view. While Waystones are doubtlessly important, are they as urgent as war prep?
As an example, say you have two units of deployable runesmith capacity
In a decade, you're going on a major, potentially risky war.
You have two choices:
1) Deploy one unit of runesmiths on Waystones and one on war prep for the next decade, and then deploy one on Waystones for the second decade and one on the many other things they can do
2) Deploy both units of runestones on war prep for the first decade and then both on Waystones for the second decade.
It would be pretty attractive to pick option 2, as it ends up producing the same number of Waystones in total after two decades but makes the war more likely to go well.
You're also not factoring in the possibility of getting Ulthuani archmages to make batteries for us, which may be possible.