Hey florent and anyone related to this topic, i just thought id chip in my opinions to this topic and try and help out a bit.
my main thought about this new system is that i think it will discourage people to buy tmuf anyway. in my opinion people want to buy tmuf because they try the awesomeness (or what was awesomeness) of nations and then want pay and explore trackmania and tmuf more. (this is true for myself.)
i also dont think pushing a 2+ year old game as you are is not the best way of generating funds, why not try something with the newer versions of trackmania on the DS or the Wii. for me certainly i havent seen either of them in the uk which isnt exactly a big step from france.
finally i think you have made a very rash, rushed and ill informed decision which will/has damaged your brand. i really think you should have consulted at least a few people that are important cornerstones and very honest helpful people in the trackmania community (frostbeule, deathdriver etc.) about the best method to mode forward from the situation you are in, i think because of what you have already gone and done without and news or conversation has damaged trackmania and nadeo forever.
i wont go on, but feel free to message me @ me on xfire or msn, i hope you will make the best decisions for trackmania as a game and an esport in this situation.
xfire : shawboy12345
msn : firstname.lastname@example.org