Big milestone? Nah. Small milestone maybe. Let me know when the top largest companies of the world are holding Bitcoin and a few large countries.
The profitable decision these holders could do is to also find a suitable selling point and release to later acquire for more to accumulate, because they can't afford to be holding their asset for eternity without selling and buying back on dip, we need to understand all these.
With the unrealized gains that they are making, holding is cheap.