A few of us on the 'Scottish Runners' thread were having this discussion a while ago, and came to similar conclusions that 2014 would be the ideal year.
I emailed the folks in charge of organising the Glasgow Commonwealth Games about 4wks ago, to ask if they had any plans (in conjuction with the Council) to do a trial run of the actual elite marathon route, and perhaps open this for limited public entry, as this could create a huge interest / publicity opportunity in the running community. They responded politely a week later, but basically saying mass sporting events are not part of their remit and they have not yet decided which event courses to trial, and indeed, said they have no obligation to trial any event. Fair enough - it was a long shot anyway, but I just wanted to put the idea into someone's head
. Anyhow, upshot was they told me to contact the Council......
....which I had already done at the same time as contacting them - I sent a similar email to Glasgow Life - I have yet to receive any response from them.