Because they won't. LOL
I'm on the fence about this one. I love my felt, and I hate Vibram soles or any other rubber soles. They're worlds apart when it comes to traction on greased cannonballs and slickrock. You might as well be out there barefoot without felt. Rubber soles suck, studs or no studs, I don't care what anyone says. I've used them, and I've busted my butt with them and nearly broken an ankle several times.
On the other hand, if the only way to protect the streams is to ban felt, then I'm begrudgingly for it, because if you leave it up to the "people," they'll just do whatever they darn well please, just like they always do, and we all know it. I'll continue my habit of listening to scientists when it comes to matters of science. You guys can theorize all the conspiracies you want...this decision isn't about money, it's about preserving what little nature we have left in this country. I'm gonna take the biologists' word for it, bite my tongue, and deal with the PITA of rubber soles. That is all. (That's my new closer...thanks J )