I'd say it means decent healthcare, universally free of charge.
Yes. Someone shouldn't have to suffer in pain because they work a low paid job, or are unemployed.
> The only way to make healthcare universal is to work out serious insurance plans
It's not the only way. The other way is for our taxes to foot the bill, as we do in the UK with the NHS.
The NHS is far from perfect, with long waiting lists and varying levels of care depending on your location - but it works, and provides universal healthcare to the whole of the UK.
PS: If we spent 5% as much on back pain research as we have on Cancer there would likely be a range of viable treatments for most issues.
As above, see the UK for a good example. TBH, I don't really know how healthcare works anywhere but the UK and US, but I had sort of assumed that other EU countries had a similar universal system to that of the UK.
> people that can pay your healthcare bills are going to be scarcer and scarcer
Your point has some validity, but tax revenues do not just come from personal income tax. Corporation tax, VAT, petroleum tax, council tax, insurance tax, air tax, road tax... christ, there is hardly anything that isn't taxed!