What deleterious effects? I live here and believe me, the second home, holiday home and retirement industry keep the local economy going. I think you need to do some research before coming out with these statements.
Second homes cannot possibly provide the same boost to the economy that would be provided by commuter homes which are likely to replace them the improvements to the local transport system that I propsoe.
I never mentioned anything about the retirement industry or holiday homes?
Have you not noticed the fact that council finances in the South West have suffered massive damage due to the exemptions that were, until recently, extended to second homes in terms of council tax?
Additionally if the Cornish economy is in such good condition, why is it one of the few areas in Britain to recieve Convergence Funding from the EU on the basis of having a substandard regional GDP?
My neighbour artisans are continually in work being paid by the people I've just mentioned. If they went (they won't though unless the green areas are trashed) all these working people who depend on the western SW ( that's from South Somerset and West Dorset westwards to Land's End, well the Scilly Isles actually) remaining relatively untouched and beautiful, would suffer.
Cornwall is one of the most intensively worked industrial landscapes to have existed in modern history, it is far from 'untouched'.
And second homes would simply not survive Plymouth and Liskeard being in the outer commuter belt of London because most of them would rapidly become commuter houses.
Why have a second house in Peterborough or Northampton and a holiday home in Cornwall when you can live in the 'holiday home' full time and still keep your job?