At this point Disney should be looking at the longview, and making sure that this whole mess is as invisible as possible when audiences are watching the Guardians of the Galaxy trilogy 50 years from now, and their best option within that perspective is using Gunn's screenplay.
According to The Hollywood Reporter, Gunn is being courted by competing studios, all of whom would "work with him in a heartbeat". Gunn is still technically on contract with Disney and won't be free to look elsewhere until exit negotiators are finished. "Major players said to be interested in Gunn's services run the gamut between studios, including Warner Bros., which has its rival superhero movies via DC Entertainment, and high-profile and Oscar-winning producers". They even reportedly sought him out in the past, although he passed on the project. That is a huge vote of confidence, however it is not entirely surprising since most in the industry who know Gunn have come to his defense, unlike the studio he helmed a billion dollar-grossing franchise for.
Bautista said Gunn had already turned in the script for Guardians of the Galaxy: Volume 3. Gunn is not permitted to entertain other offers while his negotiation with Disney is ongoing, but it sounds like he's going to have a lot of options once this ridiculous ordeal is over. While Gunn likely did not have a "pay or play" clause (at least yet enforced this far out from production) in his contract for Guardians of the Galaxy Vol. 3, he had been hired to write and direct the film, and was also working on Phase 4 for Marvel until he unceremoniously got the boot. An exit settlement needs to be reached (allegedly, Gunn's payout could be in the $7-10M range). And Gunn publicly refused to defend them, accepting his firing in his lone Twitter statement, and apologizing again. The studio pointed to past tweets of Gunn's, in which the filmmaker made light of sensitive topics including rape and pedophilia, that conservative media personalities dug up and brought back into the spotlight as grounds to fire him.