Any hints on what sort of collaboration did Apple have in mind?
Apple brings cash and their brand to the table. Tesla seems to be very good at both securing cash and building a great brand, hence Apple's proposal, whatever the terms were, seems redundant in the current environment.
If the environment changes, it is comforting to know that there might be more than one white knight interested in bidding for Tesla.
If any business wishes to partner with Tesla, they are more likely to succeed if they offer some skills and capabilities that feed into Tesla's weaknesses rather than strengths.
Perhaps! But as far as Apple goes, I think there is more competition than cooperation there! How exactly would Elon and Tim Cook handle personal relationships, reporting relationships if Apple were to buy Tesla!
Given Elon's personality and engineering bent, I think he and Tim would be mismatch. Tim Cook is a great executive and manager, but engineer he is not!
Also, Elon is close to Larry Page and Sergey Brin at Google. They are both the engineering type.
Given the bad blood between Google and Apple from when Eric Schmidt was CEO (and how Google practically stole the iPhone concept and design) there is tremendous bad blood between Apple and Google ( and this is deep within Apple because of Steve Jobs).
So, I suggest that if Apple were to buy Tesla, Elon would probably not agree to stay on for more than 18 months. And it would be slap in the face to his friends Larry Page and Sergey Brin.
A Google acqusition is more likely, but due to the new battery storage business and Gigafactory, and current valuation of about $ 30 Billion, it would be a highly dilutive acqusition for Google for many years, as any acquisition ( due to new battery business ) would probably cost Gooogle north of $ 75 Billion. Even if a combo of cash and stock, this would be highly dilutionary.
So, for many of the above reasons, I think any kind of buyout of Tesla would be rather difficult to pull off because of the new battery business, making Tesla a very very large acqusition with no near term earnings of sufficient magnitude.
One can never say never, but the probability of making this work, is quite low and quite complicated, IMO.