And I countered your point. It's been documented that this current generation is the first since WWII which will have a lower life expectancy.I never mentioned the birth rate. If people live longer (which they are) then the tax bill is higher whilst the tax receipts are lower.
Greater levels of technology might increase productivity, but require a smaller workforce to achieve it, reducing the tax receipts even more.
Any way you look at it, more people are sucking on the teat.
Technology can increase industrial competitiveness - which increases profitability and the corporation tax take with smaller workforces. It's not just about income tax.
But, lowered migration would also reduce the infrastructure spend, so you'd need less tax income anyway.