Impressive how this thread is still so active.

Keep in mind the original post was right before the BCC hard fork at the beginning of August.
Well, it seems we have our answer now, at least on the short-medium term

They seem to coexist pretty well, so well in fact that people thought they'd need new friends... look how many of those fork coins we have now!
In my opinion the community has "overall" reacted "sensibly" to this storm.
Shall you let me rise on top of my ignorance, I am personally satisfied with the outcome.
It seems most of the fear about diluting the value of BTC was indeed unfustified and the projects with more credibility like BCC (sanctioned by BTC devs) inspired more trust from the community and received more approval and exposure, thus consequently are better valued on the market.
We'll see what happens on the long run but for BCC to surpass of even kill BTC it would have to make significant advancements to its usability as opposed to Bitcoin not resolving current limitations/issues - For example if Bitcoin core implemented some kind of lightning network and it failed / was vulnerable and Bitcoin Cash came up with something that all of a sudden solved the limitations of scalability / transaction time.
All things being equal, Bitcoin Core was there first and right now still beneficiates from an aura of confidence/prestige.