Nobody is being 'forced' to do anything. I was flying all night for the knights, we had numbers (well, us and rooks had numbers). This change doesn't effect me much since I rarely fly anything with an ENY below 20, but I think even with a modifier of 7 only the La7, P-51, and Nik are disabled.
Now, Hitechs old idea of making people wait in the tower, in my opinion, WAS a way to "force" people to switch countries. This method merely denies the more popular planes to the side with numbers. You can still choose to fly (which used to be the point of the game) for whatever country you want. You just have to decide whether you get more bang for your buck by taking off in a different plane, switching countries so you can fly your La7/P51/Spit/Nik, or logging off. Since the Knights had numbers for the 3 hours I was on tonight, I suspect people are choosing option #1.