If big institutions didn't invest in bitcoin, you wouldn't soon be able to sell your bitcoins at $40,000-$60,000.
The thing is... the "rumors" about these companies eyeing Bitcoin have the potential to rise the price even before they get to actually buy.
So imho they won't tell anything if they are seriously thinking to invest... until they've already invested.
My point is that while all this sounds more than good, I would not get overly happy only for rumors, or for companies only "taking a look".