Just look at McLaren's site and you'll se they are trying to be the best at everything, not just Formula 1 racing. That lack of focus cannot be a positive thing.
Furthermore, I think that Newey is overrated, but changing the structure of the tech dpt. will not be the solution. Just look at Ferrari and see the benefits of stability.
In 2002, they felt so far behind of Ferrari, they took the wild approach of being radical to try to have a leap in performance in 2003. That explains the huge investment in the MP4/18. That panic has shown to be injustified when the MP4/17D almost took the championship last year. If they had worried in basing the 2003 car in the MP4/17, correcting its flaws and taking firm steps further in performance, I believe they would have been ahead of Ferrari.
Also, this year is the bad one to have a car radically different from last year's. With the limited mileage in training because of the 1-engine rule, being able to base the setups in last year's give the teams an enormous advantage.
To finish, as I've written in another topic, maybe Kimi isn't the right driver to lead the team. He's lightning fast, but doesn't seem to have any interest or talent for setting-up or developing the car.