He'd almost certainly want a buyout, but I'm not sure anyone would sign him immediately, especially since he's most likely still not at the point where he'd be willing to accept being a 6th man.
So presuming the Spurs were amendable to him playing for them at least through the trade deadline (between the gaping hole at PG, lack of box office appeal and his need to be on his best behavior to try to rehabilitate his reputation/value as much as possible, they might be), it'd be either that or sit at home hoping some treadmill or better team has their PG suffer a season ending injury and gets desperate.
Nah, they'd need to finish with the worst record to guarantee a top 5 pick, but I agree with the rest.
I'd be surprised if they haven't found a higher ceiling offensive player than Murray within' two years.