The most you can expect from PR damage like this is that maybe an update goes out faster that fixes the problem (or at least hides it better). Nobody is afraid of bad PR. The most hated companies in the US are also massively wealthy and successful. If people refused to by routers from companies that pulled shit like this, nobody could buy a router. You can enter pretty much any major brand of wireless router into google next to words like "hardcoded" "backdoor" and "plaintext" and get results going back decades.