so how would Bitcoin affect the 60/40 might be a matter of whether all is taken from the 40 or if some might stay in the 40...
I'm actually 40 and I was never into 60/40 portfolio. To me the "40" sucked. It was something my father, who was in his 70s, was holding when I was making my first steps in "investments" (which in other words meant I had enough money to start thinking about it).
Out of all my friends nobody had any bonds. The prime thing to own if you had funds was real estate and for those with less liquidity either collectibles or stocks (usually tech). 10 years later I still don't own any bonds. My portfolio is 70% bitcoin 20% real estate 10% fiat, although numbers can change rapidly. If we go to $100k the value of it will exceed 90% bitcoin.
You seem to be skipping both the 60 and the 40.. since 60 is equities, and when I first got into bitcoin, I was shooting towards something like 10% into bitcoin, but I actually did not realize that was what I was shooting for until I was in bitcoin for nearly a year.
You can see how my allocations have changed over the years (at least until mid-2022) in my descriptive post regarding
how my allocations had changed between 2013 when I first got into bitcoin and the time of that post... and by the way, my category of a hybrid income, that was largely a 60/40 set up within that.. but then I had other things too...
And, yeah, you can see from that chart that I had already gotten up to something close to 90% bitcoin based on my likely shared practice of not really reallocating, even though I do have a practice of selling on the way up and buying back on the way down which might end up in some forms of reallocation.. kind of at a more subtle level...and yeah, I am not sure how I feel about the allocations to bitcoin that are more than 90%. I am thinking that I am a bit uncomfortable with that, yet at the same time, I am not really wanting to reallocate, since I am having trouble figuring out better places to put bitcoin value... .. and so maybe I just have to try to be more creative..