Google announced a while ago that mobile indexing it will slowly become it's main "index" meaning mobile will have priority over the desktop index in ranks as more and more people are using their smartphone for their searches rather than desktops or laptops.
It basically says everyone needs to pay more attention to implementing Structure Data as well as adding your mobile version of your website as a different entity in the Google Search Console which I didn't know about and frankly I'm kind of caught off guard.
Slowly but shortly Google will eventually rank every website from a mobile point of view, so if you website is not yet mobile friendly than I'm pretty sure you can kiss you current ranks goodbye as mobile will become the norm as well as the main and only factor Google will rely on when ranking websites for mobile and desktop versions.
Even with all of these Google still says that if you don't have a mobile version at all they will have to rely on your desktop version for to rank you accordingly but my guess is you will miss every good rank from a mobile point of view and in essence you will only get decent rank when people search your website from a desktop or laptop.
What do you need to do to be ready for this new huge change Google's doing:
Have a responsive website design
Structure data needs to be implemented for both versions
What do you think about Google's future plans and implementations? Have you made a full transition to the mobile friendly type website?