There are two perspectives to this situation and it depends on the individual's choice and what aligns the most with him.
1. One is as you said, he can take a gamble by holding the fun tokens and if luck strikes then he can get a better return.
2. You can sell now so that you can at least get something in return for the tokens because the price is likely to get to 1 satoshi and so something is better than nothing.
If I were in uneng position then I would go with the second option.
I would chose the option 2 IMO. As far as i gathered, FUN is tied to FBC and the "crew" around it. So if those projects are failing, FUN will fail as well.
Bitcoin on the other hand will hopefully grow and grow. So should be a no brainer, atleast from my POV
Well, you both are right, we are often advised never to marry a shitcoin, this is a mistake I personally have made in alot of Altcoin investments, and I paid with my money and sweat for it.
One thing very common with most Altcoins is that rarely do we see a failing or already failed Altcoin get revived again, and the reason for this is because investors who abandoned that Altcoin have moved on and its hard to get them to come back and invest again, it's like going back to one's vomit.
So, if I really hold fun token, alot of it, I will not think wise about selling it off to save what is left, find other place to invest the money and hopefully regain what I've lost, for right now, it's uncertain if fun token will ever recover again.