One thing for sure is that the current financial crisis is unprecedented in modern times for its scale and catastrophic dimensions, and its full impact has yet to unfold. Another defining feature of the crisis has been the pace and dynamism of its development, often in unexpected directions.
Perhaps the dissenters believe they've made their point and unless they feel especially strongly they don't need to dissent again, but the rationale for this variable should probably be explored further. The purpose of bringing outsiders onto the policy committee of the Bank of England is to assure that a variety of views will be considered in the policy debate.