plunkhow about an API to rename etf2l medals for example, rather than add new ones each season.
If I'm understanding Eric's email correctly, then this isn't really necessary. All ETF2L medals have the same model. When a medal of the same model is "re-released" with a new title and description, all that's necessary is informing Eric that a new medal of the same model with new name X and description Y are required. In the email in the OP, Eric only mentions that new models will not be supported. Basically this means that completely new medals for new tournaments/leagues/charities will not be published anymore.
This also means that leagues which already have their own medals will still be able to send medals to their players, as this process is taken care of by the league, not by Valve.