I'm not sure what chance micros have outside of a specialist beer setting the likes of Silenus place. I mean even there I'm sure the brunt of his turnover is still from the macros, the few times I've been there the other people at the table not of our party were drinking the usual swill.
Our local (the thirsty bull) did have porterhouse plain on tap, which I'm sure you'll all agree beats Guinness with a shitty stick, none the less they pulled the tap cos it wasn't selling.....sad but true.