According to http://en.wikipedia.org/wiki/Usage_share_of_operating_system... there's still a long way to go, but I'm optimistic. And yeah, I really enjoy Unity. I'm a Mac user 50% of the time and an Ubuntu user the other 50. And after learning some shortcuts I actually miss Ubuntu features in Lion. Let's hope they continue improving.. (One issue that probably needs work is battery consumption on laptops.)
(Btw. thinking about buying a netbook for a longer trip now and it's sad that they all come with Win7 preinstalled now..)