I am not now, nor have I in previous posts, downplayed the price factor.
I have consistently stated that I believe the price/GB will drop precipitously- in fact, I've said a 120GB SSD will cost under $200 within 18 months.

-Comparing current SSD/HDD sales is irrelevant.
-There is absolutely no reason to expect that MS will succeed in foisting off the "Media Center" concept on a significant share of the market and if they do, it will be far enough in the future that I still think the mechanical drive won't be a part of it.
-50% of internet traffic may well be torrents but that says nothing about the percentage of users responsible for the traffic. My guess is that under 10% of PC users would be the active torrent seeders.

And finally, yes, I am perfectly willing to sound the death knell for mechanical drives.

Ironically, at this very moment I have two 750GB WD mechanical drives on order at Newegg for a customer build (video surveillance recorder) and another 250GB for a standard PC, so I'm obviously aware of which way the cookie crumbles as of today.