I am considering spending a fair bit more than I usually would on a nearly new car with the intention of keeping it for maybe 7 - 10 years. What concerns me is the possibility that within that time scale new technology may become widespread and affordable making my car virtually worthless and possibly the running costs on 'old technology' fuel making it beyond my means to continue running the car myself. Are my concerns groundless? And in what timescale would you expect this scenario to be a reality?