It's basically 1 and 5. Plenty of places have 2, 3, 4 (despite what people on the West coast tell themselves), and I'm not even sure what 6 is supposed to mean.
For all the soul-searching about why Silicon Valley became Silicon Valley, the overwhelming reason is because once you have a successful base for an up and coming industry, you will win by default moving forward. Once Silicon Valley became the initial bed for tech, tech talent moved there for the jobs, and new tech companies move their to follow the tech talent. Its a virtuous (or vicious for everyone else) cycle. That's it. Virtually every other reason is looking for patterns where non-exists.
The weather certainly helps, but I feel like that is more of a post-fact justification than an actual cause. People want to tell themselves that paying out the nose for a closet with 4 roommates in San Francisco is worth it because the rest of the US is a hellscape with weather unfit for human life. It's not, and with climate change, the California weather is becoming less and less attractive.
There may never be an "next" Silicon Valley other that Silicon Valley. But it won't be for any reason other than being a Mecca for an industry is reason enough to sustain itself.