Personally, I think this is going to be a lost season for most rookies in the NFL. Every rookie is already way behind where they should be because many don't even have their playbooks yet, nevermind the fact that they have missed rookie camps, minicamps, and OTAs.
Because of this, I expect Light to be back for at least one more year. Solder could replace him at some point in the season, but he (and every other rookie) have a lot of catching up to do when the lockout finally ends. To think the Pats will go into the season with him as the annoited starter with no viable plan B is a little premature. Light will be back if for nothing more than insurance if Solder isn't ready day one.
BTW, if I remember correctly, Light didn't start the first game of his rookie season and only got the role because the people in front of him sucked so bad. But then again, it is one thing for a team coming off a 5-11 season to start the season with a rookie LT and a team coming off a 14-2 season with the best QB in the NFL going into the season with a rookie LT who has had no offseason contact with the team due to the lockout.