According to SVB Analytics, bubble era companies make up one third of the current private technology companies.
This information paints a much different picture than the horrible nuclear winter we all remember with crashing paper values and losses of jobs.
My take away is that the underlying trends were sound and increased communication, personalization, disintermediation etc... would have a lasting effect, but the gold rush mentality overcame reality and it crashed to a halt.
Another interesting point is that 70% of those firms have received funding within the last 3 years and are significant in the current mergers and acquisition activity. Please read the linked article for the details.