No I'm not going to say that.
What I am saying is, how do you know the felt saved your butt if you didn't bust it? Did you feel your feet sliding out from under you like I do with the vibram soles? If so, then how do you know felt is better than vibram if your feet are sliding out from under you?
Everybody swears by felt, but unless you can put yourself in the same exact situation of busting your butt wearing vibram but not with felt, then how do you know felt is any better? Slide with vibram, change quickly into felt and repeat last step? Wear felt on one foot and vibram on ther other and see if one or the other provides better traction?
As for conclusive studies, I don't think we as anglers should really need it. Studies have shown that didymo can be transported in felt soles. Should we as anglers, conservators of our sport, let our sport be destroyed because there isn't 101% proof positive that felt soles are the sole transporter of didymo? I think not. I do think that we should be setting the pace to rid our streams of invasives, or at least be conscious of our efforts to help in any way possible.
When my old felt soles wore out, I went out and spent $100 on a pair of Simms vibram boots to do my part to help control the spread of these invasives as much as I can. I think every angler should be aware of and work to prevent the spread of invasives as much as possible. Even at the risk of spending a little more $ to do it.
As for the threat of falling? Wade a bit more carefully in the first place. When I wade out onto slick bedrock, I walk slowly, and if I feel my feet beginning to slide because the current is stronger than what my boots will hold, I stop and backtrack. My life is worth more to me than any fish.