Agreed, except the last part: it seems unlikely to me that they'd decide to stop
ALL factory tours if just 'empty space' and 'warehouses' were upgraded, right? I.e. the upgrades could be extensive and must be affecting significant parts of the old factory tours.
Note that the decision to extend Fremont for the Model Y likely came with a decision to not extend Gigafactory 1 just yet - and factory space is a limiting factor of 'easy expansion' of the Panasonic side at Gigafactory 1. Which likely triggered complaints from Panasonic and those leaks to Japanese media ...
The one thing Panasonic cannot do at Gigafactory 1 is to expand it against Tesla's wishes. They own their own factory lines and lease the space, but they cannot create new space. Hence the unhappiness about Elon's decision to force Panasonic to improve GF1 efficiency (i.e. upgrade the existing cell production lines instead of installing new lines).
The other motivations to build the Model Y at Fremont:
- It's probably lower capex than building at Gigafactory 1 which requires new construction from grounds up.
- It's probably faster to get initial Model Y production going, as much can be shared with Model 3 and S/X production.
- The labor market is much larger at Fremont while really strained in Nevada.
- I think the original plan was to share Model 3 and Model Y production to be able to load-balance demand/supply like they do with the Model S/X. By doing this in Fremont it's the prototype factory again - which then gets replicated in Shanghai and the other GF factories.
So I think it's overall a good call. There's free space at Fremont.