Dan's "Ping-Pong" Theory Circa 2005:
Structure of the Earth:
USGS Earthquake Stats 1990-2019 (Shows a clear increase in activity):
Supervolcanoes That Could Simulate Nuclear Winter:
Vulcanism Statistics - The Jury Is Still Out, But Currently Few Think An Overall Increase Is Occurring:
The bottom line is, these events happen on very large time scales. Logically, I can't see how moving the amount of water around on the Earth's crust that we are is not going to have an impact for centuries to come.