Why does it matter if bitcoin cash over takes bitcoin, if everyone who owns bitcoin got free bitcoin cash coins? If bitcouin cash will be valued more, you will still have the money.
Not all though as the new comers and and newly investor of Bitcoin(original) don't have the right or chances to get anymore of Bitcoin Cash so not all people is okay with that. Bitcoin Cash is not Bitcoin and will not ever be because it is a product of a Fork and it will be forever considered as Altcoin and copy cat.
Let the hype comes in and go for the mean time though and don't stress out too much with this as it so unpredictable, everything can happens in the future maybe Ethereum will be the number 1 cryptocurrency next year, who knows.