Pretty soon Grayscale is going to own all the Bitcoin...

Well, there is only one thing to do.
When the price gets really high, sell your bitcoin to Grayscale and buy into your other favorite coin. (never to use bitcoin again)

Soon after you will see Grayscale making bold moves into bitcoin mining, so that Grayscale miners can prioritize Grayscale transactions... and then it will be Grayscale-coin.

And, be sure that Grayscale will push and pull the market to get better deals on acquiring.
So, the only direction is not up, its all over the place.