I think there has been so much development in car "technology" giving us tyres that dont wear out, zillion miles per gallon if its diesel, plus low tax if emissions dictate it, that bikes are really a toy now rather than a serious form of transport for the masses. PLUS we dont seem to have the weather all year round in this country to make riding bikes a serious commuter tool.
I would say nonsense to that point regarding the weather.
The purchasing costs for bikes versus cars simply outweigh the benefits of using a bike for most potential owners. However, economy figures are all well and good, but even my old uneconomical Hayabusa would still return 35mpg. And the best thing?
It would do that whilst all the cars that do 55mpg were still sat in traffic.
Economy is no good if you're not going anywhere.
There still aren't the developments being used in bike engine development compared to the car world, with only BMW having a lean burn engine being used in the 800 twins at the moment. Honda shelved the work it was doing with the Active Radical engines, and only Lotus are trying to develop anything really interesting.
A bike is only a toy if you let it be.