Forgive me if I dispense of your favorite car in my dream scenario...
What they need to do (as dictated by overlord MF)
-Make the G35 the 'entry' Infinti. The price point makes it so, even if the performance screams '5 series'.
-Get rid of the of the M45. To me at least, it seems like a redundant automobile in terms of engine and target. If anything, it might be soaking sales from the Q. Picture it, old wealthy couple steps into Infiniti showroom, and instead of copping a Q, drops 15 less for an M. Can't be good for the bottom line.
-Get rid of the I35. Another redundant offering. One thing I hate about Lexus and Acura is that you feel like you're driving a suped up Camry or Accord. Not cool at all. I'm guessing that this wish is in the works though, as the new Maxima is out...
-Get rid of the QX45. Another redundant offering. Keep the FX35/45 as your small SUV, and the QX56 as your big'un.
-Introduce a midrange luxury sedan/coupe. Call it the J again, call it whatever you want, but NOT the K

. But it should come with a more powerful V6 than the one offered in the G35. You'd probably want to make it RWD, with the future option of going to AWD, just so you can play with the MB's and BMW's of the world. This is your 5 Series killer, much like the Q goes after the 7 Series, and the G35 after the 3 Series. Make it a true luxury car. Save the performance mods for a special edition car targetted at the M5 crowd.
-Build a sports car. You read that right. This is the one I know Nissan will NEVER do because it would ruin the Z, but it's nice to dream. Import a Skyline (do they still make those?), and make it a Ferrari beater. Price it WELL above the Z...
-Lastly, and I think I read somewhere that they were doing this already, build a convertible version of the G35.
So you'd have a model lineup of-
G35- coupe/sedan/convertible, with AWD variationMidrange M45/J30 successor with limited edition performance edition.Q45- the flagshipQX56- the Escalade fighterFX35/45- the Lexus RX330/Acura MDX fighter.XX60- the sports car.
Voila.
Perfect world. And a lineup that can duke it out with the luxury guys without infringing on Nissan products.
MF