A large part of the selling/stockpiling that was going on came from fraudulent groups. Those groups will move on to some other thing like G2A game keys, which they've been doing for years anyway.
Keep in mind actual trading in cs:go has now become "smaller" with all the fraud being gone. Only way this has big impact on TF2 keys is if the fraudulent groups were to move on to TF2 which Valve would just respond to by also making TF2 keys untradeable
My prediction is cs:go traders just find their version of TF2 earbuds with some popular AWP or AK skin.
The legit people that traded 100s of keys per day made major profits for a long time so in the end the loss they face now doesn't impact them as much as they will complain about. Calling them 'legit' is also grey area because many were probably aware where the keys were coming from
Anyway trading is lame. Thanks for reading my essay