Prince Charles’s home in Scotland is already protected by specific airspace regulations:
https://www.legislation.gov.uk/uksi/2019/1320/made
The aim of the new system is indeed to make it easy for pretty much anyone to create new restriction zones. The difficulty for them is that they have to actively manage the airspace and can’t refuse reasonable requests for access, which is an obligation most organisations won’t want.
See:
As per this previous discussion: