I think Theno & Ewood Spark both have their fair points
Gordon is correct in the demographic of the town kind of halves the 'going out' population. Of that 'going out' population, probably the average age of town centre revellers is 18-40, which again halves that population. The cost of living has gone up. People have modern bills to add to the traditional bills of gas ,lecky, rent/mortgage (mobiles & sky tv etc....) Life is getting more expensive, if you want to keep up with the trends (as most young people do) Something`s got to give....mobiles & sky are ways of life for most youngsters these days.
Ewood Spark is correct about the natural routes around the town centre being blocked off.
...but there is a third point & fourth point.
The third is the smoking ban.
It killed a lot of pubs off. I work for a brewery & 'ontrade' sales dropped 25% almost overnight, when the ban came in. I don`t smoke myself (used to) but smokers don`t want to be treated like 2nd class citizens. A good few 'every night drinkers & smokers' in my local simply stopped coming in. It didn`t bother me, but it must`ve affected takings over the bar.
The fourth point.
I do believe drinking cultures are changing. A lot more people drink at home these days. It`s so easy to pick up a box of buds/stella/san miguel etc... for under a tenner from any supermarket or local offy. There`s oodles of choice for wine lovers. You can pick up a couple of decent bottles from the same outlets for the price of several glasses of the same stuff in pubs.
How far will a tenner stretch in a pub these days? Three or four drinks at most. I can buy a box of the same stuff for that.
People still drink, but 'how' they drink is changing.