Det 1st 2013
The Maple Leafs need to add some center depth and playoff experience to their roster. Franzen is a beast in the playoffs and Emmerton is a strong 4th line center. Kindl is a top 4 defenseman on most teams in the league and is going to be a stud. There is just no room for him in Detroit (same situation as Emmerton). Franzen needs a change of scenery to boost his game. His game doesn't fit the Detroit style and fits the style of play Brian Burke is trying to bring to Toronto. The bigger the bodies the better for them. Ferraro is a prospect with top notch speed and the 6th round draft pick could be anything. The 1st round pick makes the deal too hard to pass.
The Wings get a hard hitting defenseman in Schenn that they are in need of and add a little bit of speed to the wing. A good new look for both teams. Leafs add a 1st line playoff warrior that can show them the ropes, a decent centerman, a top 4 D, a blue chip prospect, a 1st round pick, and a 6th for Kessel (top line winger) and Schenn ( #5 D on the Wings). Great for both teams.
I think you are underestimating the value of Franzen, Kindl, the 1st rounder, and the 6th. But fine... no future considerations toward Detroit.
Stop while you're still higher than absolute 0.
Franzen is a 32 year old second liner who's only getting worse. Kindl is a second pairing defenseman, something Toronto already has plenty of, and the first rounder is probably going to be in the 20's. And a 6th rounder? It's essentially worth nothing.
Meanwhile you're asking for a 24 year old who already has four straight 30-goal seasons, and a potential #2-3 defenseman (who is already better than Kindl, and is three years younger)