Sooner or later they will join but I don't think it will happen in the near future. I think the reason they haven't gotten in yet is because bitcoin isn't really as safe as other assets yet. Regulatory risks as regulations can be reversed at any time or bitcoin is volatile and does not fit their investment criteria. Or maybe they are focused on other things, bitcoin is not their current priority.
Even though bitcoin no longer serves its original purpose, I don't think Satoshi will be sad because thanks to bitcoin, he owns hundreds of billions of dollars and becomes one of the richest people in the world.
Honestly , I also doubt you or anyone will convert your bitcoin to XMR or Zcash , and let’s admit it, we care more about profit than anything else.
When institutions decide to adopt Bitcoin, the process is sometimes not easy, partly because the decision is not completely in the hands of one person. But I believe, some employees in many companies today have adopted Bitcoin, as an investment to gain profit in the future. Most people and institutions that have adopted Bitcoin are indeed only looking at the direction of profit, because that is the main attraction.
Overall, we may have talked about this quite often, and although the nature of Bitcoin is very volatile and regulation can be a threat at any time, in fact the value of Bitcoin continues to grow over time. I think anyone who looks at Bitcoin from that perspective can easily make the decision to adopt it. In the future, as you said, more people and institutions will join.