...Williams and House both are as good as gone IMO...
That ain't happening. That would leave one proven cover corner on the roster for a defense built around the secondary defending the pass.
Neither Hyde nor Hayward are cover corners. Neither are particularly fast, and neither are big enough or physical enough to compensate for the lack of speed. Hayward is a nickel corner who's somewhat of a liability in man coverage. Hyde is a nickel/safety swing man. These are not designations merely based on where they currently play; it's where their talents lie.
It's been proven that Bush doesn't belong on the field other than as a dime corner. Goodson looked pretty bad in preseason; we don't even know if he's an NFL football player let alone a cover corner.
This week it looks like House will get to build on his case for why re-signing Williams would be a poor value proposition cap-wise given Williams would command decent interest in free agency.
Letting both go commits to taking a cover corner high in the draft with the intent of having him start or spending some decent coin in free agency. That seems to be a needless cost or risk when House is getting more consistent and reliable while not likely being particularly expensive.
Given the anticipated cost, re-signing House should be a no-brainer if for no other reason than he'd be a relatively inexpensive backup at a critical position if he happened to lose the job in competition to a high pick. Heyward is an "only in a pinch" guy.
The only wrench in the works I can see is if House gets a couple of starts and plays shut-down. Then his free agency value goes up. Cover corners are in high demand. When you see Indy paying a guy like Walden 4 yrs. / $16 mil / $8 mil guaranteed to play 4-3 OLB, I hesitate to think what House might draw from a team in desperate need if he put up a couple of good games.