Electric cars already were in development. Batteries? Cellphones were pushing the development of batteries better.
There was a huge push of solar energy, Musk just capitalized in the government grants and push to develop.
Infact, most of Musk's battery technology already existed. Just not for cars.
Some of the famous cells used in their electric house ideas.. were taken from computer/server datacenter electric cells XD
Regarding your "changing things"...Changing things for the better? According to who?
He changes decisions as fast someone changes socks.
For example, he opened his mouth and uttered 4 idiotic decisions in a row in the first weeks after buying Twitter, just for him to do an instant 180 degrees later on. He contradicted himself many times and he did Uturns or blocked/banned people who showed him how bad his decisions were (like in twitter).
Also by firing a ton of Twitter staff, how he can keep his promise of "cleaning twitter of bots"?
The only thing he made of impact was:
- Destroying teams whose job was maintaining moderation and misinformation control.
- Charge people for having a confirmed mark. (Now anybody can have a confirmed mark if they pay, which will lead to massive misinformation, scams, etc..)
- Confirmed soft censorship by pushing paid accounts as top priority on user's feeds, including recommendations, sponsored content, etc..
To resume, he's very similar with Trump. Except while the big T was a fan of construction/property ownerships.
Musk is into technology.
Zuck's stole the idea of this anyway. Also he didn't build it to help people.. he sells your information (and has been caught doing it so blatantly that regulators hit him with huge fines a few times already).
As for META? it already existed.. he just wanted the ego boost for making it big with his platform.
SecondLife for example.. was ages before META and it still looks better than the META platform XD