jas, not a second home owner at all. It's the the only house we own - we rent in Belgium. As I've owned it for 26 years now, and taught in Cornwall at a comp, I think I know the issues in Cornwall.
Having to be within 25 minutes of Devonport Naval base has dictated where we lived since 1986 til dh was posted to Brussels. We could go back to Devon (being a Navy brat, I was born in Plymouth) and spend all our money there, but I prefer to pay people in the village and nearby to maintain the house, so the money goes back into the local economy within a 10 mile radius of the property.
I was 26 when we bought the house, and dh was 31, so hardly retired. I don't think I caused unaffordable housing in the county - we bought an 1835 property in the early 90s, and have spent a fair amount on it since. My part of Cornwall isn't beachy and pretty and full of the Chelsea set at Rock or Padstein and I think you'd be hard pushed to find a second home owner in the village.
I'm sad that you think the elderly are a drain on services - would you like them all put down once they reach state pension age? One could argue that the elderly are a drain on services anywhere in the UK. I note that the CTax bill for 17/18 included a 2% precept to fund adult social care (we had a void in letting the house last year, so CTax was obviously due), so measures are being taken to address this.
Super low wages - depends what you do. I wasn't paid less than other main scale teachers outside London because I lived and worked in Cornwall, and the Local Government jobs were the same pay in Plymouth and Caradon (as it was then). I'll be job hunting when I get back, as I still have 7 years of NI to pay, so it will be interesting to see what is about.
I think it's inevitable that the young people move away, especially given the jobs all seem to be in the SE. A rebalancing of where jobs are is needed for the whole country, not just Cornwall.
MIUs closing - depends how it's done and where new ones are placed. Cornwall could argue, like Devon has done iirc, that the MIUs are needed for a rural population.
IhearttNiles It's not just tourists who bring in money - those who live and work in and around Cornwall bring in money too. The tourists don't employ the gardeners, the handymen, the window cleaners, all year round. The people who live there do.
As far back as I can remember, the tourists have been referred to as Emmets and Grockels (over the Tamar). I think you have a very short memory; I can recall second homes owned by English people being burned out by the Welsh; I've heard Londoners moan about tourists on the tube etc. I expect it's much the same in parts of Norfolk.
I think the second home ownership in Cornwall has become an issue. Mevagissey has just voted against second homes, to avoid the ghost villages caused by this. I think the same has happened in Northumberland as well.