Unfortunately, protests and wall outs won't do much. Germany have taxpayer funded everything. For example, the Allianz arena was gifted to Bayern by the German government and they built the rail infrastructure around it. They also have a legally enforced ownership model in Germany where fans must legally own 51% of the club.
Football today isn't comparable since the 70s and 80's. The world's population has expanded by billions, football has gotten more popular and as a result there's more money in football. There are a finite amount of seats and demand has increased by figures of magnitude, therefore ticket prices have risen. The reason TV revenues aren't going to get fans cheaper tickets is that club's want to compete and get the best players for the team. If a club decides to reduce ticket prices, they're automatically put at a competitive disadvantage.
People are protesting at the wrong place. The FA should have allocated a certain proportion of TV money in order to subsidise ticket prices. They have the right to enforce the rules. The issue with walking out is that the tickets are still being bought meaning that you're missing some of the game for no reason. Demand for tickets is so high that even if you decided to stop buying tickets en mass, there will likely be someone else to buy them anyway.
This is how the market works and and you can't state an arbitrary value on too much or too little. The high attendance prove that ticket prices are correct.