I think part of the blame is because the brewery's are seeing how much money wanky bars make, so they close the low profit local local pubs and open new bars that attract the crowd with the $$$
that is not the breweries - at least not most of them.
other than Greene King, Sam Smiths and Marstons most Uk brewers are not responsible for the outlets, and those guys are not known for their trendy wine bars ;)
The big uk brewers (molson coors, Heinekin UK, Carlsberg Uk, AB Inbev - yes all brought out by foreign companies) are just brewers/suppliers/wholesalers.
most pubs in the UK not tied to a big chain (punch, spirit, weatherspoons, barracuda etc etc) are free from any ties with a brewery - which is why you tend to see much more choice/variety from different brewers on bars nowadays
your comments could apply to a company like punch though, they have all kinds of pubs in their portfolio and would have the power to do as you suggest.