Myself and others have asked for this several times in the past the general response is they are working on something. I use mine to buy any skin I can in the store whenever they come up if I have the pre cursor one. Even if I don't like it. Just bought the Bangalore skin the other day. Don't use her at all anymore unless I am completely bored.
The issue going forward for a trading table is going to be amounts. The example you put forth is 10K for 1K of crafting materials. Even with buying everything I can I am sitting on 360K + of tokens.(Not sure how many TBH) but somewhere in that ballpark. I know there are plenty of people with more than I have. SO there would be a rush with that example because now I have 36K crafting material and would be able to buy a ton of useless skins that in theory are behind a paywall currently.
I in no way disagree with your wanting the coins to have value I do too. The problem will be the longer they wait the harder it is going to be to implement anything of value.
Hopefully someday my stash will have some value besides being able to hot buy every new legend as they come out.