In the NFL you adapt. That's just the nature of the business. If you can't deal with change and adversity you aren't going to be very successful.
Every team has to go through it and the Saints have been one of the best at it over the years.
Monday was their latest example. When news broke that Will Smith was going to be out for the year it left the team desperately thin at outside linebacker. Immediately they struck with a reported trade to San Francisco for Parys Haralson. It's a rock solid move considering what may or may not be available on the waiver wire at this stage of the preseason.
Haralson won't wow anyone. By all accounts he is just a steady player, nothing spectacular. He himself missed last year with a torn triceps injury. But the truth is he's likely an upgrade over Smith. At 29, he's three years younger, and he's well-versed in the 3-4 as an outside linebacker position. Something Smith, if you watched the tape this preseason, clearly was not. Smith struggled and never looked that comfortable in that role.