Yes, currently Beck is being groomed behind Hartwell, and Demorrio Williams behind Brooking, but that can easily change. The Falcons linebacker position is currently sitting pretty, but there could be turmoil to come in the near future, possibly as soon as 2007.
Demorrio Williams is a RFA after this year. So he's still a trade candidate.
Brooking's contract continues to rise and the Falcons may soon reach the fork in the road that means either contract extension or cut. Despite Brooking's status with the football team, when a LB is well into his 30s, it almost always means the latter. Think Derrick Brooks in TB, who seemingly escaped the chopping block for 2 off-seasons, but may not escape a 3rd next year.
If Hartwell does not show that he is not the leader and force at MLB, it means the Falcons are going to have to look at other options, notably Beck or Brooking.
If you ask me, Beck and Brooking's skill sets are very similar. They move the same way on the football field. Also recall that when Beck was drafted, he was considered an OLB by most draft sites with a good future as a WLB. Go and read what some of the draft sites were saying about Beck, and pay particular attention to the first two analyses: http://www.falcfans.com/index.php?optio ... &Itemid=26
It sounds a lot like they are describing a young Keith Brooking. I think Beck may not have Boley or Williams's natural running speed (I don't think he plays as fast as he's timed from my limited exposure to Beck), but I think he does project fairly well to WLB, probably better than MLB because he's not a real force as a tackler in the same vein as Hartwell.
I'm not going to try and predict how the LB position is going to look for this team 2 or 3 years down the road. But because neither Brooking nor Williams look like sure fire locks to be with the team at that point, I would say Beck is just as much a candidate to replace Brooking on the outside.