According to our electoral college system, superdelegates are necessary to break ties in the event that two candidates get the same number of votes. Every system needs some method to break ties in elections. Superdelegates fulfill this need. As long as we have an electoral college system, superdelegates will be useful.
Yes, superdelegates are helpful in the event of a tie between candidates, because more input will help break the tie. Allowing more people to have a say in who is nominated among candidates is helpful, because there is less likelihood that politics or threats will be involved in some delegates trying to convince other delegates to change their votes.