There's another alternative:
In the near-term the BCH fork creates/created two viable coins.
BTC is used like gold, sparingly, with high transaction costs and low # of transactions mostly of large $ size.
BCH becomes the medium of exchange, especially small sizes.

This can come about bc the miners will be drawn back to BTC anytime the price is high, and then they can collect not only high fees but high payouts for mining. There will be an ebb and flow to both coins, as miners TRY to support BCH when BTC price falls, but keep getting drawn back when BTC rises via outside means.

Longer term:
Our take is that something will change with Coinbase fully accepting BCH in late December 2017. Large institutions will likely continue to favor BTC as the transactions costs are negligible, whereas the minnows will put money into BCH and whatever coin doesn't "mining-fee-to-death" their balance.
So THEN the question becomes, who's bigger? Institutional crypto investors doing $100mm at a time, or leagues of smaller minnows at $1,000 and $5,000 per punt? In the beginning, we think institutional is bigger, and we saw that with the rise from $5,000 to $19,000 at the end of 2017. But eventually the rise of crypto prices will draw in minnows which drown out institutions, and this will favor BCH as well as low-mining-fee altcoin alternatives to BOTH BCH and BTC. In the end, crypto currencies which can climb high without high mining fees, will win. Which ones are those?