You're right, not the time or place to go into this further. Dev had a vision but it didn't include the support of traditional music. Arguably traditional music was habitually suppressed under the early Fianna Fail governments and pretty much ignored for most of the latter part of the 20th century.
My point really was that any success and popularity of traditional arts cannot be attributed to DeValera. Later governments happily jumped on the bandwagon, once music became obviously attractive to many, especially abroad.