Yeah, it's obvious this will just cause industry-wide shift in how pricing works, it's not acceptable to developers to completely lose control of pricing their own games. The market will be flooded with insanely discounted re-sales which the developers see $0 from.
So on paper it's similiar, but the PC market has heretofore been completely insulated from the console GameStop re-sale stuff. There's also a difference between digital items being resold and physical items being resold, such as a disc. A disc most likely isn't going to be going far from it's current location and likely not going international on re-sale, there are shipping costs associated there and currency differences. I don't know if it would be super devastating but it's hard to argue it won't hurt developers of PC games. Not remotely an expert on this, but IIRC there is already a lot of currency manipulation going on with the sale of game keys, it seems likely that would flourish in this kind of environment.
It's good for consumers in the short term who get cheaper games, but in the long run that just means worse games.