Well, honestly, I think disc games should go the way of the dinosaurs. They are from another time and more importantly, as I mentioned before, they aren't kid friendly. Instead, there should be something similar to the old video game cartridges. However, they should try to make them more modern and in the current style.
Anyhow, gone are the days when your kids could have mountains of games at their disposal for play, cause I said before, the games are likely to get scratched, dirty, and possibly even broken. Note, these games don't cost much, but the cost adds up and parents don't want to waste money.