Is there a place for Traditional CAS in the 21st century?

To put it a different way, the model of a A-10 style aircraft,
equipped with cannon and guns, providing close air support and
anti-armor firepower to the troops?
Or have things changed enought (cheap PGM's, UCAV's, etc) to where
that model is more along the line of a Battleship in 1945-- no matter
how effective at its job, there are now things that can do the job
just as well or better, and are more flexible to boot?