My own NFL fandom aside, theres minimal chance of any team relocating to Oakland.
Theres also a reason why every team in that city has been leaving. The city of Oakland as a whole is still in a terrible situation financially, a lot of which was a result of the whole effort that brought the Raiders back to Oakland. In 2015, the city of Oakland and the whole of Alameda County still owed more than $100 million on O.Co Coliseum (the stadium the Raiders are leaving behind), which the taxpayers from Berkeley to Fremont were pretty much still on the hook for (as of this March, the Oakland taxpayers are still paying off the nearly $45 million in debt the city racked up to renovate the existing stadium).
(The $200 million in bonds that helped pay for expanding the Coliseum was supposed to be paid by fans buying the rights to purchase season tickets...those sales never actually materialized, and both city and county taxpayers ended up footing the costs.)