Lot of good stuff here.
I d like to point one thing: think of how will be the eco when u make changes.
Hrs would be great as trading money, but who uses runes? i mean ofc all ppl use some, but no one want to get some in trade vs usefull items... and its totaly understandable, we all have HRS... they are so easy to find for the number we are using. Some ppl came to play in january, they had 30+ hrs in 2 weeks. Thats not really what we want do we ? ;(
Runes are getting more and more useless: divine gems + facets + dragonslayer + horadrim jewel+ rare jewels makes it harder to wanna use runes in sockets.
Ganesh, guardian, heart of shadow and banish are usable, malevolent and infi are less needed with new immunities system, vanilla RW are more or less non needed. In the end, in a ladder, u make few RW, use some runes for enchant recipes, sometimes for sockets, but thats it, Hrs arent rare enough and not that usefull, therefor they cant be used in trade, coz if i am at the point i can trade a ff / cow set / TF, why would i need hrs, i surely can get enough by myself.