The Ravens have experienced awful offensive line play this year, especially when it comes to trying to run the football. It's no secret that John Harbaugh is not a big fan of Bryant McKinnie, and the big left tackle has played poorly this year and has reportedly been lazy and disinterested at practice.
While it's unlikely that the Ravens will cut McKinnie, he is now very likely to be relegated to a backup role. If nothing else, it puts him on notice that his starting job and roster spot is not safe.
Kelechi Osemele has been a big disappointment this year, but the Ravens hope that the addition of Monroe to the left side will help him raise his level of play.
It is the first time Ozzie Newsome has made a trade during the season in his 18 years as the general manager, which just goes to show you how badly the Ravens needed to do something along the offensive line.
Monroe's contract runs out at the end of the season and the Jaguars drafted Luke Joeckel as their left tackle of the future, so the draft picks should help with the rebuilding process.
It's quite possible the Ravens will look to re-sign Monroe to a long-term contract after the season, hoping that he enjoys his time in Baltimore and will want to remain with the team.
Michael Oher's contract also runs out at the end of the season, and while the Ravens would also like to have him back, they won't overpay for him and would probably prefer Monroe if they had to choose between the two.