Mobilegeddon is actually overblown, IMO, as so much of what is happening in local search, these days is happening on the Google SERP, not on your website. Google knows that small businesses lack the engineering teams and budgets to build websites with a great user experience, so they are providing that experience to searchers via your Knowledge Panel.
Tactically, I would run my site through Google’s mobile-friendliness tool. If it looks decent, you are good. If it doesn’t, time to move your website to Squarespace or a responsive WordPress theme. (And if you are not already on one of those platforms, moving will probably help your overall SEO in the long run anyway).