But you can't download an arcade where every game is 25 cents to play, not counting the many many gameovers that leave you needing more. You can't download that first gameboy your older cousin lent you for the week to play Dr. Mario over and over again just so you could beat his high score. You can't download the way it made you feel to finally get to the third stage of a boss that had kept illing you over and over before you knew how to time your attacks while avoiding theirs.
And twenty years from now, gamers from today won't be able to download the group dynamics of their MMO clan, won't be able to download the step by step evolution of Minecraft indev with it's back and forth between Notch and the smaller community. They won't be able to download all the achievements, trophies, ranks, and golden guns from their favorite FPSs. They won't be able to download the connection made between shiningly creative Little Big Planet level authors after wading through the seas of shoddily-made CoD clones and Mario levels.
I just recently got a smartphone capable of playing these old SNES games. I might download an emulator and play some games. But gaming on a touchscreen smartphone will never be the same as sitting on the carpet with my siblings, racing through the ghost levels on Super Mario Kart and figuring out exactly where to use my jumping feather to get an edge towards victory.