Federal Election TV Debates

Q122: How many televised federal election debates involving the 3 major party leaders will take place before the next federal election?
2 or fewer: 15%
3: 15%
4: 10%
5 or more: 60%
(In order to count, the debate must include the leaders of the Conservative, NDP, and Liberal parties.  A single-issue debate counts)

There seems to be a fair amount of uncertainty about the number of televised leaders debates that will take place before the next election (see articles here and here).  In addition to the broadcast consortium that usually hosts the debates, several other groups have also offered to host debates.  The Conservatives have accepted invitations to two debates, while rejecting an invitation to debates to be hosted from the broadcast consortium, and saying they would be willing to participate in up to 5 debates. The NDP have also accepted two invitations, while indicating that they would be willing to participate in as many debates as possible.

My sense is that there will probably be a 5 debates, as suggested by the Conservatives.  The usual situation in this sort of case is that the opposition parties want to participate in as many debates as possible, and so will join whatever debates Stephen Harper accepts.  However, it is also possible that the 2 debates accepted by the Conservatives and NDP will be all of the debates that will be held, or that there will be some intermediate number of debates.