Great news. There isn't really a likely scenario where he wouldn't be here until the end of next season. It'd have to be a Championship mid table finish/relegation battle if we're being run properly.
If we go up he'd get at least the following season after relegation to try and get us back up up if we went down. If we're somehow still in the Prem only a complete moron would sack him. That'd be the time to be worried about the ownership imo. Two years are necessary for basic stability, attracting and keeping players, and general medium to long term planning. I'm hoping this is a sign we have sober custodians with realistic plans already in place for multiple scenarios, rather than the entitled, unrealistic, trigger happy fans we seem to have picked up.