Personally I don't think that Google tried very hard. I hardly ever watch TV, but I've seen TV commercials for Droid. I didn't see any for Nexus One.
I upgraded from a dumb phone recently and wanted to buy a Nexus One, but T-Mobile lady told me Google required a much more expensive plan, that the buy-one-get-one free sale wasn't applicable, and that there were all other kinds of undesirable things about it. It also cost a lot of money for the device itself, and I don't have a lot of money.
So while I would have really liked to buy a N1, I bought a G1 for $99, got another G1 for my wife for free, and took them home, rooted, and installed Android 2.1 and I'm perfectly happy with it. We're on a plan that is about $30 less than our separate dumb phones and includes unlimited data and text. And none of this would have been possible with a Nexus One.
I don't see any reason why this would be part of Google's fundamental strategy. I don't have a problem with Google selling phones online or directly or being the exclusive dealer, but the Nexus One was just too much hassle and would have cost much, much more in the long term.