I agree, this is an upgrade. I hope the leopard does change his spots.
I think we should all care. One malcontent can sometimes create a huge negative storm around them, like with Adalius at the end of his run here, or Terrell Owens after year 1 everywhere, or Moss when he's not motivated.
A player like Revis can have a huge positive impact on the defense and I will keep my fingers crossed. But he can also have a huge negative impact, and I don't see how you can overlook that possibility or ignore it or not care at all about it. I guarantee the FO is thinking about it, and they must be comfortable with it or think they can change it. But they certainly won't pretend it doesn't matter.