Even now that the price of bitcoin is still below $70,000, there are people who are still unable to afford a whole bitcoin, which is never a problem and shouldn't be a problem.
 
Even if Blackrock and other financial institutions want to buy more bitcoin, the thing will still remain the same. You can only reduce the amount you will buy if the price goes all up, just as those who didn't buy when the price was below $30,000 have cut down their budget. 
 
One thing you need to know is that the bitcoin price will always move up above where it is right now, with or without this blackrock purchase. They are just helping the process speed up a little bit, but the bitcoin price is going to remain stagnant, so if you have money to buy, use the opportunity of seeing it at a low price to accumulate what you can.