Of course you can. Not sure you will fill The Albert Hall with your concerts mind... I was in a punk band in the late '70s and acoustic versions of some of my songs went down a treat in local folk clubs whilst one punk band I was in did a few up tempo jigs and reels as our encore (and were well known for it.)

Looters haven't taken over anything. If an old bloke with his finger in his ear is the same genre as Seth Lakeman then fine. Anything goes.

If some people want to call something from 1954 definitive, then folk music will die when the last fair isle sweater is stripped from the corpse. If the principle of being fascinated with and loving the abstract of music to give an identification to history is to be cherished, then loosen up.

At a guesstimate, I'd say less than 5% of those "involved" in UK folk have even heard of the ubiquitous 1954 definition and of those, most of us see it as a historical document in the evolution of our hobby.