What will this change? They could try and sell the club, but to who? Another rich person. This 50 + 1 idea will never happen. Even if the government forced the sale, you would still have to pay market value for the club, so there is no getting it cheaper. Who is going to raise the $1.8 billion needed to even buy half of the club? These protests are based on a hope that you can get an all giving owner. No amount of protesting will change an owner into that.
People have some unrealistic expectations of the next owners. Some want a sugar daddy who is not only going to shell out billions (without leverage) to buy the club, but then decide to take absolutely nothing out of it, and also pay off the club's debt. You don't need just a rich person; even most of the 2,755 billionaires in the world couldn't afford to do that. Others don't want a foreign owner, so that limits it to 56 billionaires. Even amongst those who could afford it, you are going to have to find one who would have no want to take dividends etc.
The chance of finding a buyer that fits that category is actually very low. And even some of those wouldn't be considered acceptable e.g. Saudi interest.