I think bitcoin itself is less suitable for pension funds because of its more active fluctuating price movements, but that doesn't mean bitcoin won't join in the future, I think bitcoin remains in its role and can become more popular from other sides such as investing, trading, certain transactions, and others related to a certain project.
Bitcoin is suitable for investment and it can be your gold so if you need money, you can sell your bitcoin and make money. Bitcoin should be the investment than to be the payment system because the price volatility is very sharp than the other commodity.
I consider selecting bitcoin and gold as an investment option for pension funds because both bitcoin and gold can give us the money we needed in the future. Even if the price has volatility, but in the future, bitcoin and gold prices can increase higher than today, but the increases of the gold price will not be like bitcoin price.
Related to question number 2, I think that is because gold is a personal option and not all people will invest in gold as an investment. We know that many other things can be the investment such as land, building, home, antique stuff, or else.