Reformers held that the regions needed more say and an "equal" “effective” and “elected” senate was the best way of achieving a balance between population centers in Eastern Canada and the rest of us. However, such a conception, and for that matter an "effective" version of the current senate, does not stand up to scrutiny. The problem is fivefold.
First such an argument rests on a false contrast; seats in the House of Commons are supposed to be assigned on basis of population, but that is not the case. Consider the 905. There are currently 4 plus million living in the 905 and there are currently 32 seats for an average of just over 127,000 people per riding. There are 6 ridings with over a 140,000 people in the 905, Bramalea - Gore - Malton (152,698) Brampton West (170,422) Halton (151,943), Mississauga - Erindale (143,361) Oak Ridges - Markham (169,642) and Vaughan (154,206). By contrast there are 4.5 million people in Sask, Man, NWT, Nuv, Yuk, PEI, NS, NFLD, and NB and there are 62 seats for an average of 72,000 people per riding. Moreover, there is but one riding in the 9, Selkirk Interlake (90,807), with over 90,000 people.
Second, the people living in Canada’s less populated provinces have a mechanism to assure that regional concerns are addressed; it is called provincial jurisdiction and provincial representation. By the very nature of living in a province with a small population, the 135,851 people in PEI have plenty of ways of addressing regional concerns that are not available to, for example, the 136 470 people living in Mississauga - Brampton South.
The third reason is a province is no more or less than the people that make up that province. Giving the 135,851 in PEI the power to determine everything under provincial jurisdiction, provincial representation and 4 MPs well all the while giving the 170, 422 residents of Brampton West one MP is bad enough as it is. Having one "effective" Senator for every 72,997 New Brunswick residents (10 senators in total) versus one Senator for every 685, 581 BC residents (6 senators in total) is just piling on.
Four, as Benjamin Franklin put it, having two equally matched houses makes as much sense as tying two equally matched horses to either end of a buggy and having them both pull. Having two houses is a recipe for political gridlock and pork barrel politics.
Five, leaving aside the fact that no province has a second chamber, most having abolished them long ago, and that there are numerous examples of unicameral nation states (e.g., New Zealand, Denmark, Finland, Israel, Sweden, Iceland, Liechtenstein, South Korea and Portugal), we already have a de facto unicameral state as it is -- just ask the supporters of a Triple E senate. After all, one can not argue on the one hand that the current senate is undemocratic and so contributes to the "democratic deficit" and on the other hand argue that the senate is “ineffective”. A body that adds nothing to the genuinely "effective" process can not take away anything either.