I think moveable aerodynamics are not as simple as they seems.
First of all the transition phases are to be fast and linear, this is easy for an airbrake this is not for 3D rear wing (a wing with 3D aerodynamics).
Second if for one device the weight penalty is not big for a bunch of devices it is a serious concern.
However, there're some means aviable, morphing being the most realistic now as far as active elasticity/variable geometry are concerned.
Micro actuators can shape a wing in 3D in very efficient way and could even bring better aeros for a fixed profile by applying more infinetisimal 3D shaping.
Passive elasticity is also a great field of exploration and performance because in contrary to active one, passive elasticity can responds are near the same frequencies than air changes, however the danger will be to prevent the flutter problem (when the structure moves elasticaly at the same frequency than the air changes, wich negates the damping thus gaining more more and stress) but i think regulations will be shaped for that.
All in one this is a measure of even more efficient aerodynamics.
Max mosley will then surely see what he wants, less aerodynamics appendices and more flexible bodyworks...so fans would find the cars less ugly.
I think this is a good alternative for show and F1 status preservation and goes along well with the reduction in HP planned for 2011.
But for costs, i think it is just quite the opposite!
Safety will all depends on the areas authorized to be variable.
Road revelance well hum....i doubt our cars will see morphing wings that early!
Even the passive flex of the Mclaren front wing's upper flap is not near introduction is something similar in production autos.