Disagree very very strongly with you, LTNman. Sorry, but Ryanair haven't been at every airport for all eternity, so how in heaven's name do you suppose that airports survived in the late 1990s when Ryanair was not such a major player (compared to what it is today).
There is hope for Manston. Indeed, it has huge potential and it will probably only be half a decade until the airport is needed on the SE England/London airport scene to take capacity. Why demolish or indeed build?
Just use Manston.