The relative power structure won't meaningfully shift. Levels will just change. The guy whose 1% of this pie is meaningful today may find that it is unsustainable tomorrow. The gal who lives richly on her 10% of the pie may have to tighten a belt or two tomorrow, but it's unlikely to become be existential. More tangibly, city services will pull away from non-core areas, projects and services.

Well, I think the ones that were around before the tech influx will certainly be able to ride out slower times better than the restaurants/services that have come up as a direct result of the influx of tech folk.

Because that was before, obviously. Too much of the city relies on the tech economy now - the restaurants, the lyft/uber drivers, the building contractors, the dog walkers, the private school teachers.