Is it a good idea for Nexon to make a pre-BB server? Would you care?

It failed because, even despite their efforts, they were just playing old-style in a game that had entirely changed. The fun maps are gone, replaced by the sucky Big Bang maps. No one takes the ships anymore.
No Monster Carnival. No Ariant battle PQ.
no fun.

And what exactly makes you think people will actively do them in a v.62 based server? They might try them out for a week or two, sure, but eventually they will get bored of them. The community is not the same as it was back then. You can't bring the old community back by recreating an old server. It won't work.