Holding bitcoin does not equal control over bitcoin. That's the beauty of proof of work. I welcome them to try to manipulate the price of an asset in which bailouts are impossible.
Discussion
Yes, of course this would be interesting to watch from our perspective. But they are like small kids playing with TNT.
Their behaviour enables a scenario (even if right now with less certainty) that burns down the compleate Fiat world with really massive impact on most people on earth. It would be like a first time global hyperinflation.