The new apk for netflix that 1.3 I believe is working on Xoom, Transformers, and Galaxy Tabs, you have to do a manual install though not through the market. Flash is getting better and will continue to do so as hardware improves on the tablets. The biggest advantages now is the newest flash updates allow for hardware acceleration and that significantly drops the CPU usage.
A good article about how it all stacks up is this one:
Does HTML5 Really Beat Flash? The Surprising Results of New Tests
Everything else you do have good points on however.