The DS brand is still relatively new and, while it might be a small seller in the UK, it's propped up by sales elsewhere - China, for example. The DS 7 was always going to be niche in the UK - premium SUVs from the German manufacturers dominate the market, but the smaller DS 3 Crossback has all the makings of a relatively big seller. I wouldn't be worried about the brand's future - it will be around for a while yet and, if it did pull out of the UK, we expect Citroen dealers would be able to maintain your car.