Another thing studio's have to contend with is the rapidly changing rental & owning market. 30 years ago there were no movie stores. You either saw something at the cinema, or waited for the reformatted & edited version to be broadcast on TV (this was before cable too).
In the last 20 years we have gone through RCA videodisk, at least two formats of laserdisc, VHS, beta, S-VHS, D-VHS, 8mm, DVD, DIVX, Harddrive recorders, and probably a few others I've missed.
The rental market was born (thanks to $100 VHS tapes), thrived until 1989 or so when some genius figured Batman should be available for $15. then it died-back when everything became affordable-to-buy, and is currently in its death-throws right now as "monthly subscription" services are exploding at an enormous rate from Blockbuster & Netflix to the local Mom & Pop.
So in the future.......
*HD disks will probably never sell as well as DVD did. Even if the players were free, most people now prefer monthly subscription rentals to owning (at least I do).
*Downloading (both legal & illegal) on internet will become much more popular when America's internet capabilities start to rival Japan & Korea (which is about 1200% faster)
*Cable/satellite "on demand" will further curb disk buyers. especially when surround sound, widescreen, & extras come with them.
*The "delivered" rental market, by several companies (Blockbuster, Netflix, wal*Mart) are already entrenched and willing to bring your lasy *** a movie right to your door (and will proabbly remain cheaper than "on demand").
These are all reason why I went from buying DVDs to renting ('cause when I started there was a very limited selection to rent), and went from a 500+ collection to a under 200 collection.
I'll probably only "own" 25 or so HD-disks. The rental market is just too good.