As far as I'm concerned, they can remake anything they want
so long as they do it well
. I watched the old Flash Gordon, Crash Corrigan, Buck Rogers and King of the Rocketmen serials as a kid, and I'd quite happily see remakes of any and all of them.
If the remakes turn out to be crap, well, I can forget they exist. It's not like tv channels show the originals every day anyway (perhaps if they did remake them, we might be lucky enough to see an airing of the original). But if they're good, then I get to see those characters again. Which, given tv's apparent reluctance to air those series again (and they were a staple of holiday time during my childhood) is the only chance I'll get to see them.
If anyone doesn't want to see the remakes, they have a very easy option. Don't watch.