http://techcrunch.com/2011/10/26/the-nexus-one-isnt-invited-...
http://techcrunch.com/2011/10/26/the-nexus-one-isnt-invited-...
The iPad 1 will be (conservatively guessing) 2.5 years old when iOS 6 is actually released. The Nexus One was less than 2 years old when ICS was released.
iOS 6 does support the iPhone 3GS, which will be over 3 years old when iOS 6 is released.
I'm not sure what the discontinuation date matters; if you bought your Nexus One in the short window of time Google sold it, you got less than 2 years support. If you bought your 3GS in its first year, it's still supported today, and will be in Fall as well.
I mean, is the complaint that Google almost supported the Nexus One long enough and everybody would have been satisfied if it had gotten that one additional upgrade? Because my impression is that people would have felt it was short either way — just like the iPhone 1 owners did.