I'm not really sure about all this as I'm still rather ignorant of all the details but from my experience I don't think bitcoin itself will ever go away. That's not to say that the new bitcoin cash doesn't handle transactions better in a sense of speed? This "is" a good thing but will it eventually do away with the original? I don't think so. If this was to be the case at some point then you;re saying a holder of bitcoin could go to bed one night with say 50 bitcoin and wake up with nothing or maybe over time he could just watch it dwindle away to zero and be worthless? I just don't see these things happening. The original will be there...............