The wind has gone out of the Triple-E movement's sails. The West no longer wants in because it is in. Quebec's long-standing lock on the political agenda has been broken and Ontario is too busy worrying about tumbling into have-not status to focus on anything else.
There is good reason why most prime ministers avoid Senate reform: it is contentious and divisive. A reformed Senate could provide a check on the Prime Minister's Office, though there is also the potential for gridlock with feuding houses, something seen in the United States system of divided government.