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Keith says:
CP's Membership system is a pyramid scheme held up by the instatement of new members and renewal of old ones. However, that pyramid is starting to slip, because the new renewals and inductees are lessening. The old can no longer receive as much money, and the pyramid would fall. That's why the government stepped in with the DISNEY Act, to prop up the pyramid until 2011's numbers can be bigger than the last again.

Unfortunately, that doesn't seem to happen... since it's Too Big to Fail, this is an endless swallower of debt, and though it doesn't take much for now (breaking quite a bit above even), if more renewals don't happen soon, bad things will happen.