The Birdcage never really recovered from that refit. The new owners originally wanted it to be a Turkish restaurant but that was not to be for whatever reason. They didn't really know what they were doing initially - far too many staff, not enough variety of beers, but it has got better. It's never full though.
I'd be sad to see it go, but I mainly don't drink there these days myself, despite it being quite close - was in the Brownswood last night which is about the same distance in the other direction from me.
20 years ago the Birdcage was full of genuinely eccentric Hackney oddballs and was a bit of a handful.