Another anecdote from me. I've been cycle commuting on a daily basis for 7 years now and on the stretch of the A1081 in/out of Luton have noticed more commuters each year, with a definite larger spike in numbers this year.
With fuel going up 4½ p per litre from 4th January, coupled with further increases as oil continues to rise in price, together with a general squeeze on people's incomes, this will continue to increase the gradual increase in the normal use of a bike as a means of transport. It's not going to be a sudden, massive leap in use, just a slow, steady thing.