Here's the thing.
If you really want a franchise QB, now's the time to do it. Smith has proven he isn't a franchise QB, so trading for him isn't the long-term answer. You either grab one in FA (Cousins is about as close as you can get to that), or you grab one in the draft.
If you're not sold on Cousins, then this is your opportunity to draft one. Not next year, this year. Why? Because this is the year you have the draft capital to grab the guy you want. If all goes as planned, they won't be anywhere near the top of the draft next year, and they won't have the same draft capital to move up. So unless Cousins is the man, then it's time to draft a franchise QB.
The real question is: do you think a guy will be there at #21 who can fill that role, or do you need to move up to get him? To me, it's now or never.