Drinking every night for a year (and let's say that not every night ended helplessly cross-eyed) could have some negative effects, along with the positive ones. Yes, that could happen alright. When you put it like that, it doesn't seem so crazy after all. You may even come to the conclusion that it might be a good idea to try NOT drinking every single night. That way, an experiment could be conducted to find out if it is actually possible to write anything good while sober.
Ha! Seems unlikely!