As a qualified financial adviser (who formerly worked in an actuarial capacity for the Annuity division of a leading life insurer) before working for an investment bank in a trading role with what I think most people would describe as significant assets spread over several countries I'm fairly confident that my assets will reach my kids and its likely I will be sending him to private schools so I think its probable there will be a bit of a start... eg point two
I have enough put aside already to buy him a house (in a non uk trust fund so even if I die its considered outside my estate for inheritance tax purposes - as well as the houses in the UK China Spain and Thailand he would inherit) - I am frankly pretty well off due to a mixture of luck, taking some opportunities and hard work - I would demographically be described as a conservative voter - I would from my upbringing be described as a classic Labour voter as my family were union reps and miners.
I find some of your ascertations as to what will and wont happen generally plausable, however, my point is we vote based on our individual circumstances - My priority is primarily my family and secondly my business - though the two are very often intertwined - the macro socioeconomic features you describe effect all our circumstances differently so to be honest they make little difference to me - I doubt my son will be based in the UK - he has chinese citizenship and although you never know for certain I'd be less surprised if he grew up and worked there than I would be if he was in the UK - I doubt I will be in the UK when I retire from business - infact I doubt I will spend more than 3 months in any one country as I don't want to be resident for tax purposes and I have sufficient resources to facilitate that - being told my assets wont reach my kids may suit your narrative but I dont care about a lurch to the left or right for british politics - I think society might be nicer if there was a move towards some of the greens ideals but at the same time Im not going to vote for that as they would want to absolutely rape my wage / dividends / investments / assets and I care far more about my family than everybody elses.
Finally one quick point ref the mortgages...
If average house prices are just under 200k
http://www.expressandstar.com/business/uk-money/2015/05/08/average-house-price-up-to-196400/
and average wages are circa £25K I think you may want to revisit the 15X salary and 2X deposit figures as for a couple both earning £25k that equates to £850K...