The good ones are seriously dwindling. There's a lot of 1500 quid dogs out there - basically they are rust buckets and the parts are virtually impossible to pick up to restore them...
Ford basically have discontinued the spares - especially parts such as bodykits, parcel shelves etc etc so you are right to say that a lot are being broken to accomodate the mint cars.
There was an article recently stating there were less than 500 running on the roads with a high proportion of those being absolute dogs....