I don't think physical media is going away, but Gamestop may be another matter. I don't think they are managed well. Whenever I go into a Gamestop nowadays I see this tiny little section for Switch games with huge sections for PS4 and XB1 games. The Switch basically has the same shelf space that the Wii U did. Is it any wonder why Amazon always over represents Switch sales? Tons of Switch customers go to Amazon, because Gamestop is just not going to be their store. They can get the Switch games they want at Amazon, but not at Gamestop.
Surely Gamestop knows that the Switch is selling a lot better than the Wii U, but they haven't changed their behavior accordingly.