It is expected that the majority of mobile search results will not be effected until August. Don’t procrastinate if you haven’t seen a drop in your mobile traffic you are in luck. If you have been effected it is easily corrected during this time frame.
Losing visibility in the Search engine results is only part of the reason to become adaptive. People navigating to you directly also deserve a good experience.
My advice to you is to take Google’s Mobile-Friendly test for yourself to evaluate your site’s fitness. www.google.com/webmasters/tools/mobile-friendly/
Even if your mix of mobile traffic is low right now, mobile traffic will eventually overtake desktop traffic, and mobile users are increasingly using their devices for purchase – and pre-purchase/research/due diligence tasks. That means getting your Web properties mobile-friendly – soon.