I think companies think that once they go past the threshold they will know almost immediately and then returning is a simple matter of returning to the threshold. But it doesn't work like that its more like how tires loose grip at the limit, once they start to slide they loose an enormous amount of grip and you need to roll back your use a lot before they regrip up. In tires its 30%, but the amniosity with customers that all the anti user things they have done its a never ending list of complaints and the last 10% nor 30% is going to cut it to stop the exodus. Once people have left its very unlikely they come back if Linux is still working well for them. People change operating systems like they change banks.