The context has changed over time surely and the 'revival' which people keep insisting on, is now the main context.

True, but that doesn't make revival singers anything other than revival singers. I mean, we could start referring to people who work at Halford's as blacksmiths, on the grounds that they serve roughly the same kind of function in a very different society, but at the end of the day it wouldn't change the fact that there used to be lots of blacksmiths and now there are hardly any.