To be honest, I think this is a stupid path to take. If it ever got too serious, Manutd would be blacklisted by many companies as a sponsorship opportunity. The revenue will be dented long term for sponsorship deals, owing to the potential trouble. It will be considered high risk. Combine the high risk and lower demand to sponsor them, the fee received will come crashing down. This will likely have a long-term impact.
I think this could lead to far worse financial conditions than what we currently have under the Glazers. I mean push on with this if you want, but don't go in with the expectation that Manutd will recover. It may push the Glazers to sell, but potential buyers would be put off by this action. What is already a limited pool of potential buyers will become even more limited.