Te'o won't come anywhere close to the first round, in my opinion. In the right system, he could be, I repeat COULD BE, a Brandon Spikes type of player, but he will be limited to a 2 down linebacker.
X, if the Bears could get Alec Ogletree, that could take some of the sting away from losing Urlacher.
Question is, where does Urlacher go now?
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not great looking but not as bad as you are thinking either. Best guess would be you find a replacement for Urlacher in free agency with a seasoned vet and then replace roach in the draft with someone like Brown (kansas st), Greene (rutgers) or Moore (uconn) and all those 3, especially the last two, wouldn't require a 1st round pick either.
That way you'd still have your 1st rounder to spend on the OL or someone like WR Austin if he falls to you and you are feeling adventurous.
Moore may required a 2nd round pick to acquire him. Sio has been moving up the draft boards very quickly, same as the OLB from Southern Miss (Damn, the name escapes me right now)