Prestwick is being kept alive purely for the SNP to look like they are the good guys. It's a vanity project nothing more. If it can't succeed then it should be left alone and let the bits that can work do so.
DTV with 140K passengers a year and zip cargo is failing. As a commercial airport it is simply not needed but for other types of operation then get someone in that knows what they are doing.
That is business reality. Truth is that it would be more beneficial to the area to have affordable housing and/or a business park built on it.