Shroomisaur
Smogon's fantastical fun-guy.
Exactly this. There is no reason to ban Eviolite just because it makes many NFE's viable. And it does make them highly predictable, because they must run Eviolite or suffer from horrible stats.NFEs with Eviolite are perfectly viable Pokemon. Not to mention they are forced to use Eviolite instead of other items such as Leftovers, Life Orb, and Choice items.
And besides, as long as Eviolite is allowed in Little Cup, there's going to be strong resistance to banning Eviolite in NU.
I personally would love to see a new tier, and I think it is necessary. This is because there are so many more viable Pokemon in this generation, due to dream world abilities, Eviolite, and the new pokemon. It would be great to see an exciting new metagame develop this generation.