I too watched the aforementioned concert and like most others found it deeply disappointing (but hands up those who were surprised that it was a disappointment - not many I suspect!). I have indulged in folk music both as audience and performer for 30 years now because I find it enjoyable, fun and exciting. OK there is some serious, difficult, sad stuff but mostly it is enjoyable, fun and exciting. Seems to me that there wasn't a lot of joy, fun or excitement in that concert.
I also find that I get ****ed off with the need to be continually moving forward and changing things, just for the sake of change (this is true in all walks of life from politics down but that is a whole new rant!). What is so non-pc about experienced artists, with good material & arrangements and a proven track record being showcased. There was an emphasis in the concert on relatively modern material (which was mostly weak and poorly delivered) and even the older material had to be jazzed up with the big band treatment to make it appear new and fresh. I know you can pick holes and say "Ah but this item in the show was...." but generally, as advert for the kind of folk that gives me the tingle factor and makes me come back for more, it was crap.