I think we may be better without Banks, Broomfield and Slay. Their success was when the opposing QB made mistakes, not because they were good on coverage. They have been exposed by the fact that we could not pressure any QB, but the D-linemen will be a year older and hopefully stronger next year.
I do think the Bears will be a very good team next year, probably a tad better than us, as they now add Conner and Nkemdiche to an already solid D.