You can bet prices will go down... slowly. However some things wont.
In Quill, M clays and fortification stuff was high
In Ponchee Vanity items are massively high
Combined... it almost seems like everything is OP.
Notice that mounts have not gone up or down, neither have potion buff things or SKB's. Its just the two servers that combined that resulted in this. I would expect that Clays and Fortification stuff will drop as there are more Ponchee people outweighing Quill. However, vanity items will remain OP, if not go down slightly.