It would be like in a real hospital: the brain dead patient would be kept alive with machines, because they could.
I think they should leave it like that. There were 8 good seasons and everything the charakters had ended up nicely. A reboot probably would be similar to the reboot of Futurama - the first new episode was awful, because they tried to be funny and put in too many references to older episodes.
Probably safer than eating tide pods.