https://www.vox.com/new-money/2017/2/13/14580874/google-self...
Given the context, it doesn't matter if Boston has nice universities: they become poaching grounds for Silicon Valley in that respect. The Yankees don't care if their minor league teams are in Tampa or Atlanta, they're taking the talent regardless of where it's at. The talent will almost always happily move for the right price and or opportunity.
Shockley was the spark that set SV on fire (not HP). By chance he ended up in the SV area, moving from New Jersey to Mountain View because his ill mother lived in Palo Alto. Beckman Instruments provided the capital for Shockley to start his company, which led to Fairchild (also formed by outside capital) and off it went.
Those companies would not have existed without the venture capital that made them possible. Shockley was not going to bootstrap his company, and the traitorous eight were similarly not going to leave without significant financial support courtesy of Fairchild Camera.
When the traitorous eight left Shockley, what they did would have been career suicide on the east coast. Now it is encouraged in Silicon Valley corporate culture.