So basically swap out WiiU for Switch and rename the chart to recognise the shift away from strict generations? So right now it'd look something like NS 5%, XOne 32%, and PS4 63%. Could work.
The market share graph still implies a generational link by its very nature, but that'd be better than not having any chart at all there.
Something like that yes, and put Wii U where Wii is now. I don't know what can and can't be done exactly, but if there was a way to make it so gens were still visible in some way that would be even better.
Like maybe in the "Present Hardware" chart, give Switch a certain style border(outline color) around its bar, and give PS4, XB1, 3DS and Vita a different style or border(or the same border but different color) around their bars to signify a different (last) gen. In the "Recent Hardware" chart, you also put that last gen border around the Wii U to signify its the same gen as PS4 and XB1, and you could just leave the PS3, 360, NDS, and PSP with no border, signifying they are of an even older gen.
Maybe change up the bar color scheme. Use colors to signify gens, but use neutral colors for all brands. For example, in the "Present Hardware" chart, make Switch's bar Purple, signifying new gen, make PS4, XB1, 3DS, and Vita Orange, signifying last gen. Then in the "Recent Hardware" chart, you make Wii U Orange as well, signifying its the same gen as PS4 and XB1, and you make PS3, 360, NDS, and PSP yellow, signfiying they are of an even older gen.
You could keep the color scheme as it is now (or change Nin to red and PS to blue), but instead of adding borders or changing the colors, just make Switch's bar have straight angled lines through it, and PS4, XB1, 3DS, and Vita have wavy lines through their bars. Wii U would also get wavy lines, and the PS3, 360, NDS, and PSP could have no lines.
How the borders would look or be colored, or what colors were used for what gens, or what bar markings each gen has assigned to them, could be anything. I am just giving potential examples. I am not sure whether or not this would allow you to put in the proper percentages though. It would be great if Switch said 100%, since it has no competition right now, and leave the rest of the percentages as they are supposed to be, per gen. The bar colors/markings would allow people to know what percentages are to be compared for each gen. If the percentages were wrong due to Switch being tied into this gen because of how the charts are designed, they could be left out to alleviate confusion. Maybe having the precentages show which brand has the most and least marketshare right now, regardless of gen, may be just as good if not better. I'm just throwing idea's out there. If there's a better answer for the percentages, I don't have it.