Download-only would suck for people on metered connection (read: majority of US and Canada) but a PS Vita-like approach of removable media can work very well. Optical media is too slow for many applications today anyway.
Insted of finding ways to make games more accessible how about making real good games like a few years ago people will buy them if they are in dvd,BR or cloud. Insted we get more of the same, id hasnt change its formula from doom to quake. Of all the CoD I think only CoD2 and MW1 are still the best.