There's certainly nothing wrong with keeping your 2016 vehicle for now – it'll have lots of life left in it and you'll be avoiding the current turbulent car market. If you do wish to change, you need to look at factors like how many miles you cover a year and what kind of driving you do. If you spend all of your time on the motorway, covering more than 12,000 miles a year, a diesel still makes sense. Otherwise, we'd recommend a petrol, hybrid or electric alternative. Can you charge a car at home (i.e. have access to off-road parking with electricity)? If you do, and you rarely travel further than, say, 200 miles in a day, then now could be the right time to swap to an electric car.