Yes. The sales tax consequence to amazon is huge. I really don't know why these rumors keep popping up every couple of years. Perhaps it's because Werner Vogels spoke at our weekly tech talk thing?
I'm sure that Amazon sees the internet sales tax loophole coming to an end. As states get more desperate for tax revenue, they'll be pushing hard to require internet sellers to collect and pay sales tax.
I don't know that this makes the Netflix rumor any more likely, but you can't just dismiss it based on sales tax implications.