I don't follow your logic. ...Not when it comes to making them tradable. Why would a for-profit corporation want to introduce anything that competes with the current (latest, greatest, and readily available) booster packs?
We're fortunate they still support cards from several years ago. The annual rotation used to be a lot more severe.
Hmmm I don't know how else to explain myself but I'll give it a try lol!
What I'm trying to convey is that since HGSS/BW packs are no longer printed making these types of "tradable cards" more available would not be counterproductive to the purchase of physical booster packs. Since these cards can not be used in standard (and only some can be used in expanded) it would not hurt The Pokemon Company International's business model. And then players like the OP could be satisfied having tradable cards earned from F2P methods albeit older ones (HGSS/BW). Also, old cards do inspire trainers to "collect 'em all", so it would also inspire players!!
One might try to counter this argument by claiming these cards could be traded for Standard/Expanded cards, but the only way those cards are coming to the game are via codes, tournaments (tickets cost real money or can be "grinded" for), and trainer challenges (really not viable as you mentioned). Therefore, it wouldn't affect the supply of Standard/Expanded cards.
Additionally, it would reassign a "purpose" to these cards since Legacy Tournaments are gone (although I believe legacy tournaments will return).
Edited by Pikalover5769, 11 June 2018 - 07:47 AM.