Absolutely horrendous math there. First of all, there are 300 million people in the US, but how many of those are in the employable range of ~22-70? Definitely not 250 million of them, lets say 220 million. Then, 7% of that is less than what you factored. Also, you calculated what would happen if every single person that was unemployed also owned a home, but when you consider most in that range are married, it may cut the total in half or more considering houses where 3 or 4 available workers live. Overall you way overestimate that number.