One factor may be the number of bikes on the road. I don't know about the OP's area, but around here there are more people out riding than I've ever seen. Some days you would be in the continuous wave mode if you waved at everybody and it gets ridiculous. A lot of people still wave, though.
A friend and I took a 21/2 week, 6000+ mile tour beginning the end of May. We left Idaho, went through Utah, Wyoming, Colorado, New Mexico, Oklahoma, western Arkansas and Louisiana, through Texas, New Mexico again, Arizona, and back home through Utah. We saw a lot of other people traveling by motorcycle. Every motorcycle type was represented, and I'd say easily 95% waved. Even the Harley riders, including the ones in groups. I was on my CBR1000F and my friend on his PC, so if Harley riders were going to snub somebody, it would have been us.
So you may get fewer waves around town, but out on the open road, people are still waving.
As an aside, it seemed like there were more people touring on pure sportbikes this trip than I can remember seeing before. Otherwise, Harley riders were the biggest group, followed by Goldwings, and a lot of BMW GS's and various other dual purpose bikes.