First off, anyone whom thinks they are going to axe the Wrangler Unlimited, get over it, they aren't going to cut it, they are selling WAY to many of those to lose that part of the market.
As far as cutting costs, lets try and re-use parts across the board as much as possible, and I don't meant radio's and cup holders.
Also ramp up what Mopar is putting out for dealer accessories, a lot of people would rather buy those at time of purchase and put it in their loan. maybe get jeep their own division of Mopar.
Wrangler: Current line up isn't bad, except for the engine. Give us a real V-6, 250-275 hp and around the same for Tq, then give us a V-8 option, and a diesel, look at what Cummins the DOE and Nissan are working on as a good starting point. Also wouldn't it be cheaper in the long run to just off one axle choice? D44 please, and give us 2-3 gear choices if your going to fret over choices.
Jeep Liberty: I know there is a huge cost savings by utilizing the Dodge Nitro platform, but lets go a different direction, use the unlimited frame and solid axles, full time hard top, selectable transfer case, wait i think they used to sell something like this, called a Cherokee. Make them again. Same engine choices as the Wrangler.
Jeep Pickup (Brute/Gladiator/MJ)- its really easy here folks, use the same frame for the last 2, stretch it a bit if you have to, like it or not your going to have to give an extended cab and possibly a crew cab configuration if you want to sell them. Still the same engine choices.
Jeep Pickup (M715/J-10/J-20 type)- as awesome as this would be, I don't see the folks at Ram letting this one pass. If they did it would be real easy, keep the choices down, know your not going to be the best selling pickup on the market, go for the niche, think Nissan Titan type sales. You can stick with the same engines here too, maybe have an High Output version of the V8 and diesel since your selling a bigger truck here. I would say a 1/2 ton and a maybe a 3/4 ton if you felt froggy, but thats it.
Jeep Grand Cherokee: It's doing pretty good now, why mess with it, other than it would be different components than the rest of the line up.
Jeep Wagoneer: base it off of the bigger Jeep pick up and make it a fullsize SUV with solid axles and 3-4 package choices from pretty sparse and utilitarian all the way up to super luxe.
Any other Jeep models not mentioned, were not mentioned for a reason.
overall, keep the brand geared to the off-road crowd while still drawing enough of the poseurs to keep the lights on. Which I know is what jeep says it is trying to do now. just need a bit more edge.