Even if you did this (can you, is it possible?) it wouldn't solve the problems for everyone.
Refusing the inheritance, if that's possible, would be a good solution for those who can afford to live but can't afford the additional charges for the retirement flat.
For those on means tested benefits, a property you don't live in is counted as if you had cash in the bank. So as well as being liable for all the charges, inheriting would cause their benefits to stop. If they give away an asset, that's deliberate deprevation of assets and would see the benefits being stopped too. I'm not sure they'd be allowed to refuse an inheritance. Or I mean, they could, but I suspect they'd be fucked either way.
Someone mentioned leaving it to charity or nobody.
Lots of charities don't have a huge cashflow and if people started leaving these flats to them, they'd have insufficient income to cover the charity's running costs and pay all the service charges etc on these flats until sold. For some charities, being left just one flat would be enough to cause this issue.
Leaving it to nobody means your relatives would have to be traced, even distant ones, and they'd inherit it. Only if you had no living relatives would it go to the government.
It's not as simple as drop the price and sell it. Someone mentioned already a flat for £10k still on the market in an area where they're sold new for £175k. It's not just a matter of price, people don't want them full stop. I imagine the issue is that they're bought by affluent people not bargain hunters. They'll go straight to the source because it's quicker and easier than seeking out a decent second hand one. They know if they get a new one it'll come with all the building guarantees of a new property and most likely won't need any major work done to it in their lifetime. They can just move straight in and get on with life. With second hand properties in general there's almost always something comes up quite soon that needs fixing and the greater likelihood of needing major works at some point during their lifetime. If these elderly, retired, affluent types can afford to avoid the inconvenience of this, they will. So they buy new and hardly anyone even looks for a second hand one.
For the people living there, it'll impact on the whole "community" aspect if half the properties are empty. As well as not being able to personally do anything about any useless employees, as someone else mentioned. So not quite the utopia they're being sold as then.