It would be unusual for every person to get literally 60% of their balance (exactly) in perfectly liquid form. Some will have 100% (usually those with smaller balances), some will have zero %, or up to some amount (a million or so?).
The big risk is that things stay frozen while this gets figured out (weeks to months), which will have major knock on effects if people don’t have alternative sources of liquidity.
People put money in the bank because they need it liquid (generally!).
That said, your overall point is correct, and previously the way this has been handled FDIC wise is that they have another, larger bank buy them out to provide the short term liquidity while asset sales happen.
The ~60% is the easy to value marketable assets SVB owned. The FDIC will do the accounting over the weekend and pay out whatever they calculate is covered on Monday.
The loans SVB made are less liquid and are harder to market. The FDIC will try to find a buyer and may agree to backstop some losses to get a deal done. This won't take more than a couple weeks and might get done this weekend too.
The big risk is that things stay frozen while this gets figured out (weeks to months), which will have major knock on effects if people don’t have alternative sources of liquidity.
People put money in the bank because they need it liquid (generally!).
That said, your overall point is correct, and previously the way this has been handled FDIC wise is that they have another, larger bank buy them out to provide the short term liquidity while asset sales happen.