They will. The first run of cameras would have to have to be modified but there is a good supply of new (old style) holders around. Cameras from here on out will be made to the new specs. The camera are being built to take S & S holders. Whats been happing and this works the best is to buy the camera and 3 film holders, the camera is then custom fitted to the holders you buy. Or if you have holders the camera and/or holders can be custom fitted to each other.
Setting a standard is a good start. I have seem holders from the same manufacture vary. Then there are the camera makers that make there own cameras and holders to their own standard.