Do you know how many nodes are EM protected?
Quite a lot.

There are a lot of people who want to ensure that bitcoin continues.

Further, bitcoin nodes are world wide. There will be some part of the world that is protected.

So, if we aren't blasted back to the stone age, and don't lose all of our knowledge to make electronics, then we will recreate all the pieces, and bitcoin will be back.

But, maybe, the US dollar will disappear. No money in the bank.
But, but, "Mr. Wells Fargone, your servers weren't even hit." Well, our servers were wiped, and we have no record of your account.