Both you and OP are missing the point. This will not be replaced - not because there is no scientific value in doing so - but because there is no political motivation for doing so.
Most if not all of these radio telescopes (including Aricebo) were built in the 60s and 70s with military funding. Science was never the driving motivation for building them -- intercepting Soviet radio communications was.
Most if not all of these radio telescopes (including Aricebo) were built in the 60s and 70s with military funding. Science was never the driving motivation for building them -- intercepting Soviet radio communications was.