Ya, this is a hard one.
The plus is it is a SUNDAY as if this was a week day evening with 'work' rush hour traffic, I would definitely say wait. But then again as the CON gets out, it will be crazy with everyone leaving SD for the highways and byways. I think being as it is a Sunday, if you choose to leave right away, it will be the 2 hours of 'moving' traffic. I don't think you will sit but you will move slowly. As you head towards North County (Carlsbad, Oceanside) it will really thin out and as you hit Pendleton, thins out more and then viola you are in the OC!
If I were you, I would definitely go to Old Towne and eat that way IF you indeed even hit some traffic after you have had dinner, it will not be anywhere what it would have been when CON let out AND you will not be hungry!!!
Thanks! I think we will just eat first cause traffic and hunger will make both DH and me cranky. We're using the trolley to get back and forth from our hotel in Old Town and the Con so it will be easy to eat then get the car and go. Plus that way we won't have to choose between our two favorite Old Town resturants - we'll have time to eat at both.