Nowadays he seems to be in a constant relationship with his Bell Boy, so the irresistible longing and the ambivalence of the early days has naturally faded to dust, IMHO.
The themes of the last couple of albums are completely different: Hot love in the backyard, World Peace, Israel, Venezuela, Istanbul, Police....
I'm not so sure. Political stuff aside, songs like "I Wish You Lonely", "Brow of my Beloved", "Home is a Question Mark" have the old Morrissey themes - unhappiness, loneliness, wanting things you can't have. If his early material was all about pining for a relationship, his modern stuff is more like "I've got one now, but it isn't what I hoped for and I'm as miserable as I was before." He sounds jaded.
I sometimes wonder whether the 'longing' songs reflect his real emotions or if they're just servicing his public image at this point. He isn't really known for writing blissful love songs.