Yeah, too bad they stopped making video games and computer software on cartridges.
Actually, I like to consider memory cards, namely the CompactFlash card (and to some extent the SecureDigital card), to be the next logical evolution of the cartridge, but I think I'm starting to get off topic here.
I bet in the future we'll see a situation where consoles will just download or "stream" the game to the unit from the internet. There will be no disks or cartridges of any kind. You'll see kids setting up proxies and hard drives or whatever to pirate games. As internet connections get faster bigger games won't matter. I bet some companies like Nintendo may even install cell modems in the units and pick up the bill. Kind of like a Kindle. You'll get the games from online shops.