Most of human history we didn't have electronic distraction devices and we have one Michelangelo; the answer is probably not as many as the question implies.

I don't think such genius is inhibited so much by distraction as it is by lack of support.

Either that or genius has coincidentally clustered around where the resources have been.

The world could be so much more vibrant if everyone was supported and nurtured.

In such a world, many might find much less need to distract themselves with trivialities.