Cask brewing was a growth area but CAMRA essentially won and made themselves redundant. CAMRA's initial aim was "good beer", but like many things the spirit was forgotten and only the simple rule remained: cask ale (and bottle conditioned ale) is real and anything is is inferior. Since then the US has become a world player in beer and good beer is mainstream now. As far as I know CAMRA are softening when it comes to kegs, especially now there are types that don't involve artificial CO_2/N_2 introduction but last much longer than casks due to no O_2 introduction.