Regardless of how difficult High Magic is, I think the more salient point here really is that
for people who are capable of High Magic, the enchantment is simple. Which is presumably why despite spreading our waystone model to
three different locations this turn, only one of those locations actually needed to call in Eonir wizards:
Praag-Lynsk Waystone Expansion, using Riverine Waystones, by Cothiquan Wizards. Began 2491, focused on cleansing of Chaos taint from Praag.
Templa Colonies, using Riverine Waystones, by Grey Lord Seilph and Grey Lord Sarumar. Began 2491, establishing farming and logging villages in the Misty Wood and Tangled Wood.
Cleansing of the Black Water, using Riverine Waystones, by Lothernian Wizards. Estimated completion date: 2496. Estimated completion of all currently planned fortifications of Waystone sites: mid-2500s.
Qhaysh users
are rare, but it seems to me that there's currently enough of them willing to work on millennia-lasting world-cleansing infrastructure that we've yet to scratch the bottom of this barrel.
...Assuming we can bring Athel Loren to the negotiating table, they could theoretically cover the needs of Bretonnia as far as waystones go, and all other Eonir High Mages could presumably focus their attentions on covering the Reik Basin, or at least the highest-Dhar spots - the Drakwald, the Forest of Shadows, Mordheim and I assume Castle Drachenfels.
Could we manage to cover more locations by making a different waystone that didn't require High Magic? Sure. But I don't think that we've yet to reach the point where we need to do that.
Edit: Besides which, the original Golden Age waystones were made in the aftermath of the Coming of Chaos, and needed to cover most of the world. Presumably that's why they chose to go with titan-metal and a dwarf rune - it was far less work than the alternative of enchanting each and every waystone, even though in the long run a number of waystone have been lost because they have a gold-ish looking capstone.
We're only trying to cover the Old World, starting from the worst places. We have much less ground to cover and have more time to do things.