First off, Wright and Vickerson are two of the same kind of inside linemen, where we have two very differentiated positions (nose tackle and under tackle). Both are under tackles.
Second, Kevin Vickerson is a 6th round pick and spent all of 2005 injured. Hardly the kind of player you stake your future on or pencil in as a full time starter.
Third, we have NO nose tackle candidate behind Keith Traylor. Keith is the only player like that we have on the roster. We got away with having Wright play a few games in his place, but he's a pass rushing, penetrating, TALL tackle that has attacking leverage, not anchor leverage.
Last, I thought Mike Patterson and Luis Castillo did very well for their teams this year, Tommie Harris, Vince Wilfork, and Marcus Tubbs have all three been excellent for their playoff teams, and before that there were two years of lower quality first round tackles with Johnathon Sullivan, Jimmy Kennedy, Dewayne Robertson, William Joseph, Ryan Sims, Wendell Bryant, and Damione Lewis leading the charge of busts. But otherwise I thought the percentage has been kind of good.
Really Good First Round DTs in the 5 Drafts 2000 - 2004:
Corey Simon
Richard Seymour
Marcus Stroud
Casey Hampton
Tommie Harris
Vince Wilfork
Solid First Round DTs in the 5 Drafts 2000 - 2004:
Ty Warren
Marcus Tubbs
William Joseph
Dewayne Robertson
John Henderson
Albert Haynesworth
Gerard Warren
Chris Hovan
Non-Starter Quality First Round DTs in the 5 Drafts 2000 - 2004:
Damione Lewis
Ryan Sims
Wendell Bryant
Johnathon Sullivan
Jimmy Kennedy
I'd say that's a pretty good hit/miss, wouldn't you? 32% chance of getting a pro bowl caliber DT, 42% chance of getting a solid defensive tackle, and only a 26% chance of getting a non-starting quality guy.