There's a slither of truth in that, generally speaking, but in this thread people are having a go at him because he's uncritically accepting this logic which says Labour can't win without getting a super-Blairite right-winger to lead the party, when there's very little evidence for it and much more evidence to suggest Ed Miliband is going to lead Labour to clear majority at the next election.
Take this for example
Where it ought to be, in this instance, is defined by the Blairites who want nothing more than to see Ed Miliband thrown out and a more aggressive right-wing leader put in place. Something tells me that even if Ed Miliband was 20 points in front they'd be saying the exact same thing - that at this point in the election cycle it ought to be 25, or 30, points in front. Frankly, after the drubbing the remnants of New Labour got in 2010 (29%) it's nothing short of miraculous that Miliband's been able to establish such a clear and consistent lead over the Tories. The fact articul8 can't see this for what it is a good example of how being inside the Labour bubble changes your perspective, how it changes your judegment.
It's also a good example of the process that leads even a sincere left-winger into moving to the right - it's never because they're moving to the right themselves, it's because they compelled to, or they'll never be taken seriously and therefore never win. They buy into this rhetoric because it gives them a get out clause to justify their own moving to the right. Even when they are winning, they're bombarded with a dogma that says unless you surrender your policies your bound to lose, and they use this as an excuse for their own cowardice and their own political choices.
The right of the Labour party always pressures, blackmails and threatens the left into capitulation no matter what the circumstances. Those outside the party, who aren't saturated by the types of internal debates in the party, who can look at it a bit more objectively, can see that the Blairite warnings about Labour's election prospects are built on nothing more than wishful thinking.