I disagree completely. You guys have seen the risks the wrong way around. The risk to a blind person is negligible. Most cyclists are reasonable people and are used to all kinds of pedestrians being in the cycle lane, they slow down and go around. To avoid a blind person is no challenge. You forget that pedestrians are allowed to walk in the cycle lane, and often do.
OTOH the sort of tactile pavement I'm thinking about is likely to take you out. The only reason it isn't a hazard to me is because I ride in the road, not on the shared pavement anyway. If I did, and I have done occasionally, I'll often get a mis-steer from that sort of block. As I said above, the pictures shown on this topic are not the problem, it's the much more extreme version I'm talking about.