From that article I linked to it seems there's a very remote chance of two blockchains existing in competition with each other, which I imagine would really screw with the price.
If that was more than a remote possibility I'm sure they wouldn't introduce BIP148 in this way. Seems more likely that either BIP148 will be widely adopted, or widely not adopted. Not a disaster either way.
@pembo210 Any comments from someone who's not full of shit?
So if things go not according to plan, then bitcoin will probably lose all value?