My guesstimate:
It will cause some uncertainty here on steem and will also keep the steem price down for a while.. until people discover what voice is and what not...
.. in the end I actually believe it will boost steem as there will be users that want to blog on voice but actually don't do so because they want to stay anonym and end up signing onto steem.
However for eos as a commercial platform and to onboard new users it will be huge!