No, I simply disagree with the math and find that number implausible. I believe that most masternodes will ultimately be compromised, either directly or via VPS or other back doors.
When you deal with entire eco-systems, then you simply have to try your best at the area of your expertise.
Our own PCs might be compromised. HDD firmware, processors, network equipment firmware, software backdoors, RNG fixing, etc etc. And then the entire Internet might be controlled, thus someone like NSA can see the whole network flow in a "transparent" way. If we take such hypotheses as somewhat probable, then no coin will ever be private or anonymous. We (all people involved in anon projects) might as well throw the towel and go home.