I have offered refutations to "the conversion theory", the dilution theory, and other made up hogwash that suggests that every common shareholder will have to write a 200 dollar check to the preferred's for every share of common we own.
The only "evidence" of the conversion theory, for example, is preferred speculation. There ARE a class of shares which are "convertible", but none of them are FNMAS, FNMAT, or other fannie preferreds.
If someone tries to vandalize my common shares by making them "convertible", I will report them to the police, just like I would report to the police if vandals try to cut off the roof of my car and make it a convertible.