For any deal to happen this season we'd either need a long term injury to a core player or to send Keith Ballard the other way; even assuming Mason Raymond stays out of the lineup until the end of the year we have to clear $5m in cap space for Weber (and more if we are trading away a player like Schneider who must also be replaced).
So Ballard is the obvious player to make the cap numbers work, but does Nashville want to commit three more years and $12.6m to this guy? We can ask S_C to go into great detail about why they wouldn't but the short version is that he's a bit of a riverboat gambler for whom it is not unprecedented to have a bad season here and there. And this coming from a poster who likes KB4.
But yeah.. I think the core of the deal has to be Weber for Ballard and at least one other player off the roster (likely Hodgson), and to make it even slightly appealing I'm sure the Preds would want to take their pick of the organizations best young players. Schneider, Schroeder, Jensen, etc.
In order to make this happen in season we would basically have to sell the farm. The thing is, Weber might actually be worth it - but I doubt the Predators even think about this unless their season is an unmitigated disaster. Even then I would guess they'd try to deal Suter or even Rinne and hope they can fight back to contention while they still have a shot at re-signing Weber.