As for the HD re-release? Work was done of those games and IMO that is a new game. Do you think they did a simple recompile on that and it magically worked on PS3?
As for other revenue streams? Yes, publishers and developers have explored DLC, IAP, season pass and other methods but none have been consistent across all games. Just because everyone and their mother buys the DLC for Call of Duty doesn't mean it works for everything.
There are options for the game industry to evolve in, you are not stuck to one revenue stream as most of you claim to be (Industry)
Everyone is the me too crew, no one takes risks, the one that do and prosper damn well get to earn their keep
Ubisoft showed how amazing a 6 hour SP campaign in the way of Blood Dragon can be prosperous for them at the $14.99 price point
It was a gamble/risk, it paid off ten fold for them
Just because most of these band-wagoners just attach themselves what the hot shit running through the industry is, doesn't mean all revenue streams are exhausted
DLC's for game can become Episodic Content
Add-Ons can go from morsels to huge ass expansions
There are avenues not yet tried due to most being scared, their hoping others try first, if it work they take the plunge
The industry is in safe bet mode, everything is sequels, a few sprinkle of continued support, see you in 2 years, have money waiting for us, and don't you dare sell our title, if you love us, you would care and protect thy devs/pubs honor