Bitcoin is going mainstream, millionaires massively investing in Bitcoin only because to increase the price of Bitcoin and get media attention to make it mainstream.
Actually theres millionaires who invested on bitcoin but it just on hidden way i guess because they dont like to exposed themselves on public but with this kind of action or adoption price will surely rise because bitcoin is really a good investment specially on longer runs.
All the big names in wall street own bitcoin already. If you have friends working in wall street on london city they will agree privately that they are holding BTC and so are their bosses. The conspiracy of stock whales owning BTC portfolios is very real. Im sure real state whales Trump are looking at it already too.