"It wont happen, if it does noone will go anywhere because it will be financially impossible"

Well, I don't have a car and I get to work Ok, I have also been to well over a dozen festivals this year, which is as many as I can afford beer for! You can keep transport costs down by going to fairly local festivals (luckily I live in Yorkshire with a great choice of festivals), or by buying your train tickets in advance and getting cheap deals, or by going to Irish festivals (£22 to fly to Shannon and a couple of quid for the bus to Ennis, or £55 the whole way on the bus if you want to be greener).
It does influence the sort of festivals I go to - camping is pretty much out of the question now as due to advancing years it is too much of a struggle with all my backpacking gear plus fiddle and concertina. So greenfield sites are out, but I prefer a town based festival anyway as I like a choice of comfortable pub sessions instead of a draughty tent. What you spend on B+B, you save on not running a car, which is not just the petrol costs but depreciation, repairs, etc. Driving and camping will always be cheaper for large families or groups, but for single and couples there should not be much difference.