I'm going to go ahead and say Tesla is in the same boat as Oracle or HP, as a company where its biggest innovations are in its past. It will likely join Oracle in moving to Texas as a way to save money but not attempt to make further innovations.
OTOH, a few established firms with large campuses leaving also means a lot of space without the usual problems involved available for other established firms that get into lots of conflicts with other local constituencies when they try to expand.
If I'm a SV startup I already have problems with office rent, taxes, cost of living, etc. It's expensive to be in the Bay Area. And on top of that, most of the engineers I hire will either be of worse quality than FAANG or I'm going to have to pay them more than FAANG. While this is great for the employees, it's really hard to fit into the budget for many startups and the tradeoff becomes existential when the cost of your engineers starts adding up but you haven't found market fit yet. And the ever-increasing wages being used to draw people from one company to another just keeps making the Bay Area more and more unaffordable so the problem keeps compounding.
It works nicely when there's just one or two big companies to draw employees from, but there's just so many big SV companies now with billions of dollars in their pockets, I don't see how any true startup could possibly compete. If you don't like Google, you go to Uber. Or Facebook. Or Splunk. Or Airbnb. Or Yelp. Or Twitter. Or Facebook. Or Salesforce. Or Workday. Or Juniper. Or Autodesk. Or Nvidia. Or Palo Alto Networks. Or...
There's just too much competition from the billion-dollar companies. Sure innovation and entrepreneurship still happens in SV, but I'd argue it would be better for the area if it were easier for smaller startups to compete.
I interned on their SQL engine team and maybe half of the long-time employees were ex-Oracle, including two of the three co-founders (Thierry and Benoit).
after they get their green card, they fan out to smaller companies/startups....
so, yeah, it is a loss.... (albeit small) for the bay area