It makes perfect sense why some of these newer titles are only available in SD. You can blame the studios. They would like to sell SOME Blu-Rays, after all. And, you can always get the Blu-Ray from Netflix in about 2 days, at most.
I don't really see Netflix as the way for me to catch the newest flicks out there. That's what my Netflix Blu-Ray subscription and RedBox are for. Honestly, instead of being annoyed by what's not available on demand, I simply look for what is available--the first season of the amazing Louie show is available in HD, for example. That makes me happy. I only caught a couple of episodes and now Dish is having a spat with FX.
The stuff loads super fast, too, compared to the disc.
Don't forget that you can still search on your computer and add titles to your instant queue.