1.4 x almost nothing = almost nothing. Again, talking about increases or decreases is meaningless when only the absolute level is what counts. Cycle rates are nowhere near the levels that would lead to a significant reduction in bus usage. Bus companies can rest easy because Britain is not competent enough to do cycling properly. Mode share in English speaking countries lag behind almost all other countries, never mind Denmark or the Netherlands.
I know you like to move the goal posts in any debate so your non-existent transport utopia comes always reigns supreme, but let's be serious here. The average elevation of the Netherlands is the lowest in Europe, and depending on which website you use, the second or third lowest in the world, promptly followed by Denmark. The golf course on the Maldives hardly gives much competition.
Arnhem is a mere 13m above sea-level. I change elevation greater than that walking to my nearest bus stop. The highest point in the country is a mere 322m above sea level, and even that is shared with two other countries. I have stood on top of it (having eschewed the bus and walked up from Vaals), and I've walked more strenuous hills in suburban Manchester, let alone Rome. 95% of the Netherlands is at an elevation lower than my house on a fairly insignificant hill in the North Downs: https://en.wikipedia.org/wiki/Geogr...File:Hypsometric_curve_of_the_Netherlands.svg.
It is also the densest populated country in Europe (city states aside), so how does this work with your argument that you don't need density to have a good public transport model?
There may be wind, but it is substantially easier to cycle on flat or near flat ground in wind than uphill. It is hardly surprising the modal share is so high, even if it had UK-style infrastructure.
The fact remains that there are a variety of reasons why cycling infrastructure isn't as good as it could be, and, much like the grey vote, one of them is the voting power of car drivers. @TheGrandWazoo has already commented that it is no surprise there has been no increase in fuel duty since 2011. Even where there is 'perfect' infrastructure such as London, there are still claims that the 'average' cyclist doesn't feel comfortable using it because of the attitude of the 'lycra lunatics' using it like a motorway. Or rather like the 'gentleman' who felt the need to F-and-blind at our coach driver this morning for daring to pull away from the traffic lights without letting him go first because he felt it more appropriate to be in the traffic lane on the right-hand side of the coach rather than the expensive infrastructure provided on the left-hand side of the coach for his own safety?
There would also be more cycling if we got to a position where in medium-sized towns and villages you had almost every shop providing a bike stand that you wouldn't need to lock your bike to for fear of people stealing it when you pick up a couple of pastries, as used to be the case where I lived in Germany.
Anyway, back to Buses...