Retirement plans means one thing, they are looking to hold for as long as they could hold. This is a good call I must say but I don't think it's a good idea to put everything in one basket because when a person goes to retirement, it means the person has stop working for money and is just resting and using some small change to pay bills but I think using some part of the fund for Bitcoin is better and the use the rest for an investment that can give passive income.

The reason why I'm saying this is that Bitcoin is volatile and it can favour you or gives you loss if you buy at all time high. It's not a bad thing to invest in Bitcoin but it should have been with a fund that you are ready to risk it all incase anything should happen, you are ready for any consequences but a retirement money is not something anyone can let go and you know shit happens, you never can tell tomorrow but it's good to be optimistic though.