I'm not convinced this is that big a deal for most people. UK average mileage was 7900 miles in 2014. Even if you say the engine goes pop at 120k miles, that's still 15 average years of driving. Let's be honest, somebody buying the 1.0L Mondeo is probably going to drive fewer miles than average, so I don't see that being a bother for anyone, even if it does suffer reduced engine longevity. Any slight bump in an old car turns it into an insurance write off anyway. Average age of a car in the UK is 8 years.
If I had a choice between a modern 1.0L Focus, and a 1.6L Focus of roughly a decade ago, you see what difference you're talking about. Better performance (25% more power, 33% more peak torque), far better MPG, lighter. General torque curve means much more lower down power, so you have to work the gearbox less.
Hell, look at the current 1.6 Duratec engine, and convince someone to get that over the 1.0L.
If these engines were going pop at 50k I'd think you had a point, but they're not.