What has been tried in the past is not working.
Bringing in new coaches has not worked probably for the same reason the Bills probably have the most first round busts of any NFL team in recent history - bad judgment.
Ralph can complain all he wants, but if he wants to see a winning team again, he is going to have to open up his wallet and get some proven experience in here directing a return to the playoffs (example: look at what the tuna has done for the fish).