Hellywobbs, I think you are mixing up formula feeding and formula companies.
Formula as a product is not evil. It will always be needed- including in the very extreme circumstances you've listed.
People's concern is with the formula companies. They are not just seeking to increase market share, but to increase the market for formula itself. Their interests lie in normalising bottle feeding and there have been many, very detailed, discussions on this on here. No one is daft enough to think women say "ooh, there's an ad for formula, I'll bottle feed now". However, formula companies carefully market the advantages of bottle feeding (See the debate on the "I'll do my share of night feeds" ads), they try to indicate that their product is just as good as breastfeeding ("Does my tummy look unhappy?" ads and the Immunofortis debacle) and they normalise the use of a bottle. My 15 year old cousin, for example, thinks breastfeeding is "icky" and asked why you'd do it when formula is just as good . My cousin is not dim, but she has definitely been affected by the commercial messages around her as she has grown up.
Do you really, honestly, believe that formula companies are not trying to increase their market? It they were just competing with other brands, wouldn't their adverts be like many of those you see for supermarkets - i.e directed at proving superiority to the competitor product. SMA, for example, don't advertise as better than Aptimil. They all advertise by direct or indirect comparison to breastmilk.
People are not condeming formula, or the mums who choose to/have to feed that way. In fact, some of the ff mums I know are the most damning of the very companies they buy from. Ideologically, there is a strong case for formula production being effectively nationalised, with no profit motive and simply different formulations for people's needs. It would never happen in reality, of course...