I'm also in the not sure camp.
I totally support Civil Marriage on paper, and for removing authority from the ultra orthodox but I would not like to empower the anti sovereignty pro internationalist supreme court and their Left wing post Zionist voter base. If a separate, Dati Leuimi and/or Masorti run institution can be erected with sufficient checks and balances then I think I'm ok leaving it in their hands, if not... then I think a separate institution needs to be created to officiate true civil marriage with no Leftist or haredi hands on it, which I doubt will be possible- at least w/o another million Soviet or French (aka non religious hard core Zionist) Jews in the country.
Both the Left and the Ultra Orthodox camps erode our national consciousness, both camps are detrimental to our well being IMO, and for all purposes, equally. Also, I don't think its important to placate Liberal galuti religious institutions like the Reform movement in Israel, they are disappearing anyway and will be gone in 30 years or so. Inversely, mildly or moderately halachic movements (True Zionist, pro Aliah groups) should be supported and opinions somewhat weighed in the national consensus though.