OK, goldencrowns I am obviously missing something. I am not an economist, but there must be something wrong with my maths. Assuming someone takes up a mortgage with a 25 year fixed interest rate with repayments of 500.00 a month.
Are you in the UK, hitting? The missing thing is that 25-yr fixed rates are nearly unknown here (and would certainly not be available to an FTB) - nearly all UK mortgages are short fixes, and the available interest rates (SVR or not) are related in some way to central bank rates. So if the central bank interest rate rose, mortgage rates would soon reflect that.
People assume wage inflation must necessarily follow general inflation because that's what happened in the late 20th century. However, it's perfectly possible that wages could slowly decrease in real terms whilst general inflation rises (in fact, that's exactly what's been happening since the financial crisis). Central banks have pushed mortgage rates artificially low (and used QE) so that some groups of voters see their mortgage payments reduce, primarily because they are a big voting bloc. But in the medium term there is no particular reason why we should see an uptick in wage inflation - in fact it is far more likely in the long term that we won't, as Eastern globalised markets start exporting price inflation to us whilst they experience wage inflation.
So far globalisation has been kind to the West, but we don't produce very much, unions have little power, and employers can now relocate away from our labour markets very quickly, so there is no real driver for real terms wage rises here. Whereas central bank rates (and mortgage rates) are unlikely to stay at their current historic lows forever. Some might say (and do say) that we are almost certain to have a period where we get poorer compared to the global average, particularly given that the average postwar Westerner enjoyed huge (and often largely unearned and undeserved) prosperity compared to the global average. Our economies also have a massive demographic burden of pensions coming up and little productive industry to support that (we have relied on using credit expansion to sell the same houses to each other over and over again at increasing prices in the last three decades to give the illusion of prosperity, but how is our economy geared up to support that in the future?)