Let me understand this: you want a business to have enough capital to pay its expenses for 12 months on zero revenue?
Holy Jesus; that's massive.
Capital is not free. Typical costs of capital today are about 8% (1). You're proposing, essentially, an 8% tax — not on a firm's profits, but on a firm's expenses. I don't want you to think, "oh, that will push a few firms into failure, rendering their entire business unviable." I want you to think, "it will spare a few firms." I also shudder to think of what happens to firm formation in the face of the steep, steep barriers to entry this raises.
You propose a very, very expensive way to build resilience. You're right, though, that the costs would be borne by all of society. Maybe it's worth it? But it's a hell of an ask, and I'm skeptical.
(1) if you have better figures than http://people.stern.nyu.edu/adamodar/New_Home_Page/datafile/... then I'm all for 'em