Your joking, do you really think if bitcoin doesn't succeed it will still have value as a collectors token? Maybe physical bitcoins will but what sort of collector would want to purchase a digital currency that has no use.
Confederate dollars have value to collectors because of the history involved and the fact that they are real.
Historical significance of BTC will only last until the next digital currency surpasses it, is anyone still buying ecash to collect?
No, I am not joking. Bitcoin is different than many other centralized digital tokens and represents and important shift in technology and historical significance. There is a core group of ideologues that won't give up on it(This is both a good thing and bad thing). If another cryptocurrency that is far superior to bitcoin comes along than we may switch to using that for everyday transactions but still keep a few bitcoins and asic rigs mining for sentimental purposes. In that event bitcoin could drop from its high (5k-100k or more?? in the future) to a much smaller number, 5-500 usd depending upon the adoption rates before it becomes obsolete.
Even if Bitcoin is obsolete the ledger and tokens still have value to us. This value is not in the digital token itself but in the network protocol and what it represents.
This being said , I also recommend gold (if you can secure it) as it is unlikely we are going to find a large amount of it soon on earth or through asteroid mining and creating it is too expensive. Gold isn't a good investment , but a good store of value.