So it's not because they are crap at all it is because of: "their management companies, suppliers, tax hikes, supermarket cheap booze.".
Your words not mine.
I personally never claimed the cause was the smoking ban per se. My objection was because of your insistance that they failed simply because they were crap.
OK, there's a few different things going on here - sorry for not having the desire to write an academic piece on it.
In my experience:
A number of factors affect pubs. They are listed above. The smoking ban, relative to these other factors, is insignificant.
Aside from those factors, a significant driver for the closing of pubs is the fact that many, many pubs are simply crap. They have not moved with the times and make no effort to add value or create an experience. Consumers do not go to a pub simply to buy a drink. They pay extra for an experience. Many pubs fail to do anything other than provide a roof and some alcohol in a glass. These pubs will close. However much one likes any pub, unless it is doing something to attract customers, it will fail. Staying the same and not changing works for one or two pubs every now and then, after all, for some people, going to an old-fashioned old man's pub is an experience. But it's not sutainable, certainly not compared to pubs which invest time and money in creating experiences, but it a big investment in becoming a gastro pub or a recognized music venue, or simply putting on a quiz night or installing a juke box or something.
If you want I could send you a report we wrote for one of the leading brewers about how to save the pub, but it's about 160 PPT slides, so you might get bored...