There is certainly an argument to be made that, for many of the uses that people have for "bitcoins", BTC and BCH are close substitutes. Conversely, a "jstanleytoken" is probably not a close substitute for either BTC or BCH, and is certainly not a close substitute for dollars.
Another way of looking at this is to observe the market cap of both currencies after a fork; in theory you'd expect the total market cap to remain unchanged, since the newly forked currency is presumably either worthless OR has worth only to the extent that it removes value from the original currency. In practice, this doesn't seem to be occurring.
Really? In my personal life I find that BCH and BTC are just as widely accepted. :)
(...which is to say, precisely 0 vendors accept either, of course. Most people are not picking a crypto currency based on their ability to conveniently buy a coffee with it just yet.)
Another way of looking at this is to observe the market cap of both currencies after a fork; in theory you'd expect the total market cap to remain unchanged, since the newly forked currency is presumably either worthless OR has worth only to the extent that it removes value from the original currency. In practice, this doesn't seem to be occurring.