The wonders of hindsight I'm afraid. Had there gamble paid off and this years car been quick, it would have been the evolution group feeling silly.
McLaren took a risk, and its not worked. But you don't become one of the most successful teams in the sport by playing it safe.
Personally I think its utter horse manure anyway, ultimately the rules dictate the limit of the car in general, if you said Red Bull were at the limit last year, then there is basically nothing more to gain, if Mclaren were, or weren't, doesn't matter now. They've jumped onto a new car, which is well beyond the pace, there is nothing, not a single shred of evidence that the new car can be faster than the Red bull, just because its "new" doesn't mean the rules don't limit it to essentially the same speed as Red Bull, all they've done is ensure they don't have a competitive car for at least, IMHO, half a season and I think the second half will AT BEST be close to the Red Bull/Ferrari, but not ahead of it and certainly not ahead by a margin large enough to be worthwhile.
All we've seen for 3 years is the fastest car itself doesn't matter, the most consistent car, on average, over all 20 races gives a team the best shot at a driver and team title. Screwing yourself almost certainly for half a season is beyond stupid, in hindsight or not.
Mclaren aren't THAT good, that they can make a new car and expect it to be significantly ahead of a Red Bull or Ferrari at any stage of the season, and if you throw away half a season you need a car THAT much better for the rest of the season.
Thats in general, but I also strongly disbelieve the idea that other cars can't develop a car or that the Mclaren has more potential for development simply because it currently sucks.
Mclaren could easily have made a fundamental error somewhere in the car that kills downforce that means any other downforce improvements become next to worthless. Every car at any stage has potential to be improved, and any car can have a significant fault that is holding the car back significantly.
"We've been pretty stable for the last few years, so there are not big leaps. I think everybody is just going to be putting tiny bits on all the way through the season - I hope!"
As pointed out by himself, he's HOPING other cars don't have significant improvements only because he doesn't think his car has any significant improvements coming, not that cars can't.
That doesn't all ultimately mean what Mclaren did was wrong, they know what the 2014 car is, the 2014 car might be MUCH closer to the current car than last years, and a year with the new style suspension, working out the kinks, trying some things, testing out some ideas that will be on next years car this year, isn't a bad risk to take even if it tanks this season.