Tron is very unlikely. Not due to political will, but because no one would want to buy it for any useful amount of cash. Not to mention the time it would take to set up and close such a deal. If they have to sell things off to make a buck, they are going to be selling thing they've already been made offers on. You might as well be suggesting they'll sell the rights to "The Black Hole" - I'm sure they would if there was a ready buyer and it'd make a useful dent in their red ink.
Tron would be like being $130,000 in debt and selling off your funko pop & retro console collection. Its just not going to make a useful dent in the owed debt.
@GeneralFriendliness suggested ESPN and I can see them jettisoning that; sell off another money suck while there's no sports to profit from.
Disney would normally try to raise money by offering distribution deals - things that would have no bearing on on-going rights. But with nothing being produced/ nothing to sell... that's proably not going to be a substantial source of cash either.
My guess if they have to sell things:
They'll sell off 20th Century Fox assets before anything Disney. Its assets that aren't really "their's". It's also going to depend on how long they have to wait and how bad they need money. If they need money fast, they might have to fall on their swords and let Sony have more Marvel licensing, possibly X-men or Fantastic four as that's the only thing they have a for-sure ready buyer for, but Sony is also cash strapped IIRC.
I might try to do an explanation post of WHY the Rat's lawyers are so rabid, but I don't know that I could properly explain it except to say "Its all interconnected and if one thread unravels, the whole fucking thing comes apart". If you license out anything that even appeared in anything with Mickey, you are now undermining your ability to show you've never, ever allowed anyone else the rights to Mickey under any circumstance and your iron-fisted control over all Disney IP has no ground for dispute.
Also, just in case you have doubts about just how effective Disney lawyers are:
On Hamas Palestinian TV, literal Palestine where they have shows about 6 year-olds with guns and pretend suicide vests, they used to have a character called Farfour.
Farfour was a very blantant Mickey Mouse rip off they were trying to use to subvert (bootleg) Disney Merchandizing for their own ends of propaganda (lacking the expertise to make their own toys, they copy something that already has toys)
Anyway, Disney was not very happy about this state of affairs, and the popular Farfour character was killed off shortly after Disney's legal team got to work.
tl;dr
Literal international terrorists backed down and caved to Disney's legal team's demands
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