i dint think bringing back carb'd OHVs with distributers, impaling dash instruments, unlaminated windscreens and no rear seatbelts would be a good idea, so you can see the reasons for the government wanting to push towards modern technology....even though the way they go about it defies logic at times. You have to remember that the people who run 'older' cars are a minority, so Government is hardly going to tailor their policy to suit a few regardless of how strong their argument is.

be careful with how you use the word 'classics'. A 40 year old car isnt necessarily classic. The best thing about the increase in new car sales is that the used car market will be cheaper and people will always keep a car running which is cheap to run.
if anything, in 40 years time a 40 yo car will be worth more, because even though they are built better, they still arent built to last more than 10 years / 100k miles.
parts for 'newish' cars are frequently binned from the list and NLS. Especially as modules and sensors become so bespoke to a particular range/model which will make their lifespan compared to Novas or Mk2 escorts very limited anyway. i think its only natural that older cars will die out.