I can't see how the way of life catalogued in Raglan Road has "gone the way of the dodo". Some things change in the world, but not all by any means all.

The words of the poem as Kavanagh had them published are available in any number of anthologies or collections. As a song it exists in numerous variants, that being the way of songs which are transmitted through being sung widely. I think that is something to rejoice in.