If there is a tech bubble that bursts, I don't see how much of middle America would be affected. "So, the people in SV can't get 1-hour grocery delivery any more. How does that affect me again?"
Your time and expertise in these areas will give you better insight that most other investors will not have. See Warren Buffett's "circle of competence".
'Course, that invites some comparisons to equity in startups...
In Portugal it caused the first signs of the current crisis, and caused quite a few of us in IT to move abroad.
Despite not being invested in complex derivatives, middle america sure noticed the banking crisis.