I know this post is 3 years old but the only thing I can say that you just don't hear artists of anyone over 30 these days.
Terrestrial radio ain't what it used to be. The big labels push their product onto head office, which distributes the goods to all the stations in their network. There's no room for discretion by a music director nor space for independent music like "Now". The other "problem" with "Now" is that half of it is Jason's baby, so it's going to be hard to release a single like "Now" without Jason around to sing it on tour. And now that we have this internet thing, which the band has fully embraced, do they really need radio play to keep on touring as hard as they are today? And they're still touring with Lee's rig so that they can keep making music that they're free to release whenever they want.