that's demonstrably false. there's plenty room of you're willing to pay enough in transaction fees. if you don't want to pay $5 in transaction fees to cash out $5000, that's your problem. either that or you don't want to pay $5 to cash out $10, but in that case that has no appreciable impact on trading volume.

>For a bitcoin that has scaled see Bitcoin Cash.

if you mean bitcoin with block size limit lifted, then yes. but right now it's handling less transactions than bitcoin so it's not fair to say it has scaled.