If your only criterion for performing a song or tune is whether you like it that reduces folk music (or other the form of music of your choice) to mere entertainment. It reduces "traditional" "folk" music to nothing more than a stylistic choice.

It could also lead you to some interesting technical challenges!

Incidentally, I also believe that traditional fruit and vegetable and floral varieties ought to be preserved, and it pretty well goes without saying that the narrowing of the animal gene pool carries serious risks.

In that context, whether or not there is a traditional music degree (compare "a modern languages degree") there ought to be an "English folk music" degree course for otherwise the English tradition is not as fully researched or understood - and indeed possibly not as widely performed, so that it is at risk of loss.

Whether or not you like Comhaltas it has played (it seems) a valuable part in getting Irish traditional music widely performed and accepted. A degree in English folk traditions would be one good way to seek to do the same for England.