"Core" gamers have used Skype, Teamspeak and similar stuff for communication in previous Nintendo online games so why should they ignore Splatoon because of missing voice chat?
In most games it's about team tactics anyways and, tbh, Nintendo would just put everyone in the same chat and destroy tactical communication. It might be cool to come up with secret phrases so only your team understands your comments but that'd be something for a fun match but nothing serious "core" gamers want to do.







