What I don't think outsiders (outside of the Triangle) realize is that there are numerous companies in the Triangle, not only in RTP. It is the entire area (Raleigh, Durham, Chapel Hill and all surrounding areas) not just the "office park" people think. The amount of high quality research coming out of Duke, UNC, and NCSU is quite impressive.
RTP is not even comparable to the URP (this was doomed from the beginning and never maintained a heavy research or think-tank component like RTP and was never even in the same league). I don't think the Triangle will be Silicon Valley but will be the major player on the east coast with Boston for a long-time.