Sorry but never heard of these coins either...

Just speaking generally, coins with no real use or genuine value will disappear as soon as the people promoting or hyping them stop.
The crypto world is hopefully becoming wise to P&D tactics and hopefully, like black hat SEO tactics, we see them less and less.

In saying that, and if NETCOIN are doing stuff to add value and resurrect their coin with updates and real strategies then I say good on them and hope they do well!