Have to agree with the general comments. Nothing worse than playing with a crap drummer, we've all done it. Makes the dreadful task a... dreadful task. Look at it this way - it's not a jump into nothing, because: You'll still have somewhere to live, work, friends, social activities. A band, no matter how committed you are to it, isn't the whole of your life. This may be a great opportunity to take a step back and rethink what's important to you. If playing bass in a gigging band is still important to you, then you'll find a way of doing it. Whatever you get into can't be much worse than the situation you're in now, can it? And chances are, it'll be a big improvement. Quit! You'll feel better for it!