It is impossible to calculate everything in advance with absolute accuracy. There is always the possibility of force majeure. And those problems that are obvious are already known and spelled out in white paper.
Force majeure is usually either ignored or a reserve fund is pawned to compensate for possible consequences, a kind of insurance. By the way, it would be interesting to introduce an insurance mechanism in ISO.
Yeah, it would be great. As far as I know, not so long ago ended ICO with a similar idea, where the guarantor was a platform with a voting system.