Well, I think it's important to remember that there is no majority. The majority doesn't belong to the government or the opposition; there is an equal number of voices, and the Speaker, if there's an equal number of voices, is left with the unhappy role of weighing in.
Speakers and chairs of the Board of Internal Economy with whom I've worked have been very deft at avoiding that kind of situation. As I say, I think this has happened only once in my time as secretary to the board, so I wouldn't call it a shift.
I understand what you're saying, though, about credibility and about the idea that you might fear that the Speaker—impartial though the Speaker is, having been elected and so forth, and impartial in presiding over deliberations—might be inclined, by virtue basically of the ideology he represents in being a government member, to side with the government, say, and therefore create a majority there. But I don't think that would be a fair characterization of the way that Speakers—and this Speaker as well—handle the role of chair of the board.