Hmm It's debatable if Burns is folk at all. Most of the big songs were produced for aristocratic patrons, or aristocratic lovers. I think he would be delighted to have his songs covered by as many people as possible and in as many styles, so long as they were popular, especially if like today, they meant money in the writers pocket.
I enjoy the popularising of folk music as long as the performer has a genuine love of what they do, and can transmit enthusiasm for the product to their audience.....didanyone watch the faces of the crowd as Daoiri and Four Winds played.....magic.