Memes aside, there might actually be some permutation of this if Barb passes away in her sleep. Chris will be in denial and refuse to accept reality. We will get a series of cryptic/psychotic posts on twitter/facebook and everyone will have a suspicion that something is up but not be sure. Then a few days later the truth will break out. That is assuming she slips away quietly and quickly.With her deathly "naps" she takes I could see Chris ignoring her for at least a day or two after she passes, especially if there's some new cartoon Sonichu nonsense going on.
Like everyone else I doubt that he'll just hide her body unless Barb tells him to, but that would mean she actually gave a fuck about him after she dies.
It seems like it will never come but in all likelihood anything can happen to Barb at this point, especially with Covid going around. All I can say is that I hope Chris will be okay.