By the time other car makers going to release any serious competitor to Tesla , Tesla's software will be far advanced than those companies, and the thing about software is its design and implementation takes professional teams with a lot of experience. No matter how effective and advanced your team is, you need time to create a professional team to make mature software.

So the idea of other car makers somehow magically will design and implement software as mature as Tesla's , is wishful thinking I think.But software companies like Google, Microsoft, etc have required expertise in software development.