In terms of what are the next products Tesla should develop, a starting point is looking at what is needed to complete the mission Clean Energy and Transport.
Transport, essentially more of the same including:-
- Vans
- RVs
- Compact $25K cars.
- Possible future $15K ultra-compact car?
- Bus?
On this list the only really difficult thing is the $15K Ultra-compact, but if they want to do it, they will find a way.
A public transport solution isn't needed, because Boring Co tunnels and Robo-Taxis will fill that niche.
I'm not even sure a bus is needed.
For clean energy:-
- Home HVAC / Hot water
- Lighting
- Cooking?
- Refrigeration domestic and industrial - including refrigerated transport.
- Lower cost grid transmission HVDC components?.
Overall we are close to "Mission Accomplished" on clean energy and transport, although execution is always the difficult part.
The next consideration is if Tesla will make great products in areas not related to the mission if the opportunity was there to make a great product make some money and perhaps achieve an incremental improvement in human happiness
The list here is long, simply because there are many products that can be improved.
- Phone/Tablet/Laptop - could be the best product in this category worldwide - would include Neuralink integration
- Social media - moderated by AI - great for humanity, even if not a big money earner.
- Home construction - highly automated - 3D brick printing CAD based - with Tesla domestic appliances batteries and solar
In terms of the Phone/Tablet/Laptop and Neuralink, Neuralink requires a phone. With a mobile Starlink terminal these devices can be used anywhere on earth. I suppose a "Neuralink Gateway" device could replace the need for a phone, but adoption of Neuralink will be slow.
So IMO if they stray beyond their mission they need to use core competencies in areas closely related to current areas of expertise.
One question would be the internal management bandwidth if the company becomes too diversified, but Tesla and Elon have already demonstrated the ability to innovate in a wide variety of fields simultaneously. As clean energy and transport becomes closer to "Mission Accomplished" it becomes more routine, my hunch is they may want new challenges to keep the team energized.