I don't believe the public knows for a second what they want, other than that they want something better than today. All of the options can look attractive to the public, depending on their level of understanding of the issue, how the questions are asked, what options are on the table, etc... Of course, the public has a very poor understanding of the issue, and their perceptions are clouded by years of rhetoric from the media and politicians, so whatever the public ostensibly prefers (and keep in mind that the public will prefer different options based on the framing of the problem) has nothing to do with which option has the best technical merits.
Asking the public which option is best is almost like asking your 12-year-old for an opinion on mortgage options. Yes, they're directly impacted by the decision, but they're so hopelessly undereducated that any advice they give is effectively worthless. Ideally, living in a representative democracy should fix this problem, through allowing the public to elect learned representatives to make educated decisions on their behalf. But transit in Toronto has been so politicized, that politicians are now pandering entirely to the whims of public opinion, which the politicians themselves are directly manipulating with their rhetoric. It's a vicious cycle that ensures that any decision made in this area will have nothing to do with what is genuinely the best option.
Sometimes I wish we lived under the rule of a benevolent technocrat. But with human nature being what it is, there's no such thing as a benevolent technocrat.