So you're worried Bitcoin might get coopted eventually? Bitcoin has withstood numerous attack attempts, each of which has ultimately contributed to make it more resilient. Just because your enemy uses the same tool as you doesn't make the tool less useful. Bitcoin went "mainstream" because it was the only way for them to stay relevant, since they realized they couldn't control it. You should see this as a win, because now it puts everyone on the same level. No one can create more units and devalue your work. Regarding privacy, we can certainly enhance it over time by implementing various layers, such as ecash and coinjoin.