Disclaimers: 1: I'm not from Indiana, I live one state down. 2: I don't have stats on hand, this is pretty much entirely anecdotal.
Banning carryout sales from restaurants is silly and ineffective. If someone wants single serve alcohol there are plenty of opportunities for it with or without restaurant carryout. I worked in a drive thru package sales store for a couple of years and sold plenty of single serve bottles of beer, premixed drinks, and liquor. We kept a nice selection of all of those in the big cooler so that we could sell it cold. Gas stations do the same thing with a smaller selection. All banning restaurant carryout drinks does is make it mildly more inconvenient and cost restaurants some revenue.
Restaurant drinks are expensive. Happy hour makes them a bit cheaper but still significantly more expensive than packaged sales. Happy hour may contribute to the problem for social alcoholics but it's far from the cheapest or most dangerous form of social drinking. Restaurant drinking has a safety net because restaurants that serve alcohol have a legal responsibility to limit the amount that their patrons consume and police regularly sit outside looking for drunk drivers. Focusing on happy hour at the legislative level is picking the low hanging fruit and isn't going to achieve much more than hurting restaurants.