Whatever sentence he gets {hopefully custodial} for driving i have no pity, drink drivers are all potential killers full stop, call me harsh, but if he would of ran a relative of yours over and killed them would he still be your friend?
As for the assault on the bouncer, it seems your friends struggle to contol alchohol, the bouncer must have been genuine ie vetted by police and sufficently trained to deal with your ''friend'' otherwise hitting an unlicenced bouncer would of almost certainly put your friend in hospital, so he got of lucky here.