Given the personalities involved, zero chance.

Not my area for armchair opinions but if the leaked documents are real and they are burning a lot of money then the negotiated purchase cost may be low enough that SpaceX could "pull an IBM" buying it to destroy competition and merge some of the tech into Grok or replace Grok. I doubt this would happen but it's not an uncommon practice. OpenAI is not public yet so a hostile takeover is not an option. OpenAI would have to want an exit but if that were the case then SpaceX would have to perceive a path to profitability that OpenAI has not realized or chosen not to take.