That's assuming the BCH chain lasts that long. Bitcoin itself has only existed about 10 years or so. Who can say what will happen in the next 20-40?
I guess it's just hard for me to imagine BCH not reaching it's full potential. It's like watching a movie, being introduced to a character, and knowing they will save the day.
BCH is astonishingly close to the same issue for which BTC forked. This next ABCvSV hurdle makes or breaks the BCH version. If it dies, we'll be perm-storing on a different blockchain.