a) Be quiet, and try to be as productive as you can.
b) Look for a job, then quit.
c) Look for a job, and while you're looking, make a first approach to the most receptive management or near management member you can think of. Maybe lunch or beers. Give him a non-emotional, short executive summary of the problem and its consequences. If you get a positive response and you think he understood (pick your manager carefully for this), consider how to cautiously proceed.
All three choices are equally valid. c) is obviously complicated and risky, so you have to consider (among many other variables) whether you care enough about this company and your relationship with it to try; whether the entrenched are "know it alls" or are they willing to learn and be better; whether management are managers or slave drivers; whether you can afford a period of unemployment. In other words, is it worth the risk.
There are likely other companies that match your goals better than this one.