Quote from the1:
You are assuming the people who hold those mortgages will not be able to pay the reset amount. Remember, they are a higher grade borrower and many of them probably bought the house with the increase in a mortgage payment factored in so the default rate will probably be much lower. And the banks that do face losses as a result of the defaults have the Fed's zero percent borrowing plan. They have guaranteed profits by having the ability to borrow for nothing. The next crisis isn't going to come from real estate. It's going to come from too much government debt.
Yes, government debt, but also inflation. Especially if as you say the Fed keeps ZIRP in order to protect the banks that suffer losses from the resets.
You speculate as to their ability to pay on these mortgages (the home owners), but you really don't know. If real unemployment remains, barely improves or in fact worsens, there is no way to be so confident that these resets won't be devastating.