This appears to have a lot of similarities with the dot-com bubble where the new internet companies were thought to quickly overrun the old, "uncool" companies. It just doesn't happen like that. Plus there is a vested interest in the home countries of these car companies to see that these companies survive. Sure some of them might be ripe for losing a lot of market share, but they still have time to catch up as the world is slowly turning to mostly EVs. It's not the same as with internet companies where people can switch their search engine the next day if they so desire.
Note that Panasonic, which will actually be making the batteries, has indicated in its own investor releases that it is working on developing the batteries but they aren't anywhere close to production-ready yet.
The other announcements relate to making the batteries cheaper, but would not otherwise extend performance (and in some cases would reduce performance, but due to the reduced costs would come out ahead on a $/kWh basis).
Multiple other manufacturers already make and sell EVs, in some cases outselling Tesla in their home territories.
Moreover, while Tesla assembles their own batteries, the underlying battery cells are made for them by Panasonic, which owns the IP to the chemistry. (Tesla's IP relates to the assembly, referring both to the process and the finished battery product.)
And that IP is only valuable until the inevitable switch to solid-state batteries, which have significantly more capacity and durability than anything on the market today. And other automotive companies have already acquired exclusive licenses to the most (commercially) promising research.