Sebring should be dug up and brand new tarmac laid down on the circuit. The final corner also needs a LOT of runoff added to it.
It's a brilliant layout, but the bumps are way too big and the crashes we've seen at the final corner are just waiting for something more serious to happen there. New tarmac and get IndyCar to race there. If F1 wanted to race in Florida, a relaid Sebring would have been much more epic than the new Miami circuit.
A bit of a late response...but...holy crap no.
Firstly, F1 would never go to Sebring. Almost no U.S. race tracks rate for F1 and that's a great thing. F1 tracks are inherently boring as hell. When a race track is designed "for" F1...it ruins it for pretty much any genuinely exciting racing. I'm absolutely chuffed we have little to no F1 quality tracks in the United States. Even repaved, Sebring wouldn't meet the other silly criteria for an F1 track (thank god).
Secondly, the crashes at Sebring while looking big...have been car-destroying but relatively safe. You don't end up in the (numerous) tire walls without making a stupid move or having a vehicle failure. We've seen no actual driver injuries that I can think of for years (excluding perhaps some minor series I'm unaware of racing there). The F1 approach of "add 100 yards of extra run-off" is the death of motorsport. Also, consider the fact you're seeing a couple of crashes over the course of a 12 hour race - it's no more dangerous/crash heavy than most other tracks.
Ask, even the drivers, and they overwhelming LOVE racing in the United States
because the tracks are old school. The drivers actually like that. Very rarely, if ever, do drivers express concerns about safety. Drivers in IMSA, etc. rave about the older tracks with grass run-offs and bumpy pavement. European drivers are often giddy when interviewed the first time they drive at Sebring, Road America, Watkins Glen, Mid-Ohio, Mosport, etc...BECAUSE these are not clinical, sterile, boring F1 modern tracks.
There is a reason that re-paving these great old tracks is widely considered an unforunate necessity when a track portion breaks up. The character is in the track, including its flaws. It is part of the challenge, and the identity of the track. It's also part of the technical challenge. It's why the engineers in IMSA work so damn hard to figure out each track they visit. In F1 you have different "types" of asphalt but it's considered a crime if it isn't perfectly flat/straight/manicured, etc. In America you have a huge variety of track surfaces from good to rough, to insane...and that's where the engineers earn their money.
I can't think of a more heinous motorsport crime than to pave Sebring to make it more "F1" like. That would be similar to when they paved Pikes Peak and irreparably changed the heart and soul of that event.