By all means let us stick to the point.

Thread title - UK Folk Revival 2018

Question asked - How much is it now propelled by Commercial pressures and what are the advantages and disadvantages of Commercialisation

That there is a current Folk Revival in the UK is arguable - I see no evidence for it.

Commercial pressures have shut down some quite long running folk festivals and caused others to limit their scope in terms of times, venues and selection of artists invited to perform.

As far as "folk music" goes as I understand the term commercialisation has no obvious advantages for the genre in general, it does however have many obvious disadvantages, as commerce decides what is marketable and what is not, as previously stated the way things are going leads to an ever diminishing return.