With 20% of search now coming through voice, 2018 is the year that you need to get on board as the % is going up, not down.  I've written before that in ten years we will laugh about the use of keyboards.

So somebody in your organisation needs to take action now.  You are probably sitting OK that if somebody searches for your product or service on a search engine by typing a search request in, they should find you.  It might not be your website (it might be), but they might find your blog or social profiles.  If this isn't the case you have some catching up.  I'm not going to talk here about Intent data, that is a subject for another day.

2018 is where you need to invest the time, if somebody searches for your products or services using voice, you need to be sure they will find you in exactly the same way.

Let's not forget, a friend of mine spent a shed load of money optimising their website only to get the wrong leads.  Understanding your ICC (ideal customer criteria) is also key.

So assuming you are happy with the 80% of search, you need to plug that whole of 20% of voice!