The solution to CLA proliferation is not the proliferation of CLA use, which is what your suggestion involves. If you want to solve CLA proliferation, it's as

The solution to CLA proliferation is not the proliferation of CLA use, which is what your suggestion involves. If you want to solve CLA proliferation, it's as easy as not going out of your way to add a CLA to your project followed by insisting that people sign it. Let the strength of the license (and your faith in the choice of license) stand on its own.