You're all missing the big picture. This is the tipping point for T&F. Tearing down Hayward and putting up something new and able to handle the Worlds and future is part of that. The Worlds won't be in Eugene without this new place, so that's needed. A future where track isn't so niche would require a bigger place, so there's another element. You either prepare for the future, or let it leave you behind.
Des Moines, Iowa, anyone?
University of Kansas built a dedicated track place, and as soon as the cornfields around it give way to anything else, it will be quite a nice venue. It will snag events (should there be any).
Hayward reminds me of the old motordromes all around this country. Not too many of those left now, right? They gave way to the future. That's all this is. There will still be a 400m track there. It will be better. If track survives, it will be a nice place. Those who outlive us will find it suitable.
These, not so much: