No more than it's a blow to me when the movie I paid $10 in theaters for winds up in Redbox for $1. If your enjoyment of a device is predicated on its features not being available to others, you're in for a world of disappointment.
How did you read that on my words? That's not even a good comparison. A better comparison was when the original iPhone got its price reduced by $200. It was a blow and Apple acted accordingly. If Siri were to be available tomorrow for iOS 5 devices when most people didn't even get their iPhone 4S I would expect it to be a blow to a good part of the early buyers.