Re: HD experts, help an idiot!
That's kind of the point, Baba, they'd pretty much have to remake every episode from scratch. Re-edit it, re make and insert SFX and then they'd have the episodes. And that's not counting any likely clean-up that'd have to be done to 20 year old TV episodes as the film has degraded some.
Is it impossible? No.
Is it going to happen? Not unless Paramount is willing to invest a lot of time and money into the project.
For me, and for many of us, the future is now in the past.