All valid points, but... 2.5% would be a huge hit - you're talking about taking down like 600,000 of America's 25 million businesses.
Of course some are more important than others but when we get down to small segments that are higher value, we can get by without those for a day or two while either the computers are repaired or the work is process manually.
I'm not saying it wouldn't be a big deal or that it might not be painful. But when we talk about day to day dependencies, then we're talking about survival. I am still unconvinced that I need a computers to survive.