The title really says/asks it all - which franchises or series are worthy of being continued or revived, which should be left dead, and which should be abandoned/halted/put out of their misery?
Now, when it comes to series you would like to see brought back or revived, this isn't your chance to simply rattle of as many old series and franchises that you just so happen to like. Actually consider if a comeback is possible, required or a sensible move - would it actually turn out positive?
As for series that you want continued, this may include series and franchises that are either: a) still in production, or b) have been gone for a short while, but have not been confirmed to actually be dead or officially ended (like 'Monkey Island' in its current position, I guess).
Series that you think should be left in the dust are series that either turned horrible, or just were horrible, that should never ever see the light of day again. Edit: Or, of course, it can just mean a series that was good, is now gone, and should be left untouched and untarnished in order to preserve something good/great.
And series which you think should be halted or stopped are series that that are currently running, or have the potential of having further installments, which need to be put out of their misery before they can do any more harm to our world.