I'm not really understanding your argument I guess. My point was that hub of finance for the U.S is largely dependent on co-locating where the sun rises first in the U.S. and Silicon Valley has no such analog. So while the hub of finance could move somewhere else on the East Coast its very much limited to the 17 states in EST and then further limited by states with cities and infrastructure that can support it all.

The finance hub has actually moved a bit. Tt was in Philadelphia before NYC and "Wall Street" moved away from the area around the actual Wall Street after the Sept 11th attacks. Wall Street is largely in midtown Manhattan now and New Jersey. But still on the East Coast.