I must admit, I am deeply conflicted over this. Not because I think the addition of alcohol (even if it were from a beer cart on Main Street) will detract from the park experience as some fear, but because it wasn't how Walt envisioned it.
Disneyland is still a dry resort, with the exception of Club 33. They could, of course, make a killing from the locals who frequent if alcohol was offered, but have chosen to honor Walt's legacy by not doing so within the park.
However, I also really really want a margarita while I'm on vacation and waiting on line for a ride, or the parade, or fireworks, or at a counter service restaurant during peak dining times.