Amazon clearly has the best catalog of titles for streaming, Netflix has exactly zero new release titles.
I expect the MPAA will be heavily involved in setting subscription streaming prices, since one of their chief gripes and reason for refusing new titles to Netflix has been the low cost. If the studio doesn't get it's flat fee per title, the service won't get the title.
Studios are too dumb to look at the total amount of income, instead they focus on the "per use" charges. I frankly doubt we'll ever see a low-cost subscription price for new release titles.
Vudu has thus far avoided any major studio ire, but their per-use prices are too high for most folks.