It would be amazing if it were true (I don't know).
The problem is that the only major thing where closed drivers rule is ARM graphics and for this argument to work someone has to move to have the first mover advantage so that others can loose.
Thing is in the ARM graphics market there is no first mover. All drivers are closed and will probably stay that way. When nobody sees declining numbers it will be hard to convince ARM SOC manufacturers to demand FOSS drivers. Damn you chicken, damn you egg.
Let's hope the Linaro guys read this and come to the right conclusion. IMO ARM is hands down the most important arch for Linux.