Redskin Field it is then.
The Fed Ex sponsorship was for $205M over 25 years. Its due in 2024, Fed Ex will likely not renew that deal. Given that anyone who thinks about coming in after them will face backlash, or require the team change their name in exchange for a $350M over 30 year type deal, if Snyder decides to go it alone and not have a sponsor, to just name it Redskins Field, he's going to forgo anywhere from $200 to $300M.
That's far too much for him to ignore.