I always think W.S. Merwin's poems will last of anyone writing today. If I had to bet on posterity I would bet Merwin. My poems could easily evaporate. So I don't know. If you find yourself as a writer thinking about posterity you should probably go out for a brisk walk or something.
Billy Collins...pleasure, of course, is a slippery word.... Our pleasures ultimately belong to us, not to the pleasure's source.
Billy CollinsVade Mecum I want the scissors to be sharp and the table perfectly level when you cut me out of my life and paste me in that book you always carry.
Billy CollinsMore often than not in poetry I find difficulty to be gratuitous and show-offy and camouflaging, experimental to a kind of insane degree - a difficulty which really ignores the possibility of having a sensible reader.
Billy Collins