Sure, more availability increase will happen. But the availability of items is already sky rocketed higher than classic ever did, due to being in the same expansion for far too long, endless poopsocking and farming of items, etc. There's been enough fungi tunics looted to swim in them, but it's still a high value item.
When people on this server BIS a toon, they just make a new toon and BIS it. T1 guilds have a lot of members getting epics for their second, third, fourth alts. The server is what it is. It'll be fine - in-demand items are going to stay that way.