This is a really interesting one.
I'm not sure I really believe in the advertising-changing-our-culture argument - I think the human race is just programmed to always go for the easy option. For the last 1000 years there are plenty of examples of inventions we have embraced because they made our life easy, even if we got a less good result - formula is just another.
Now I know someone will come back on this to say breastfeeding is much easier than bottle. I agree, it can be. But not for all women for a variety of reasons, and often not right at the beginning.
There have always been women who couldn't breastfeed or wouldn't breastfeed - hence wet nurses. For much of the 18th & 19th century upper class women did not breastfeed to speak of, but passed over to wet nurses. This was principally an attempt to encourage upper class women to have children closer together and discourage working class women from having so many children (the contraceptive effect of breastfeeding). So historically we have probably been given the impression that breastfeeding is something you only do if you can't afford to get someone else to do it for you.
Working class women who couldn't breastfeed tended to use asses milk, which is actually quite close to human milk in composition. But it wasn't until we learned about sterilisation that bottle feeding really became a viable alternative - but historically there always has been an alternative.
But it is certainly true that a whole generation almost completely turned away from breastfeeding in the 50s and 60s (my mum breastfed but I believe it was culturally a real battle for her). I think a big part of this was the post-war views on how women should present themselves (not showing breasts), coupled with a real cultural change towards machinery, obsessive cleanliness (easier to see a bottle is clean) etc. It will take time for that cultural view to change.
I live in a part of the country where bottle feeding is the norm. Both types of feeding were discussed at parentcraft classes with breast encouraged but not shoved at us. However, one woman said she 'did not like the thought' of breastfeeding and I think that sort of attitude is quite common. I was the only woman breastfeeding on the maternity ward the night I was in.
Not really going to a conclusion with this one, just throwing thoughts out. But, I did want to say I don't agree with Lizzer on her opinion that bottles should only be used as last resort. I didn't agree with the woman on my parentcraft class but I support her in her way to feed her child in the way she feels most comfortable. I believe that formula is nutritionally 'good enough', albeit not the best choice. Let's face it, parenting is tough enough, expensive enough blah blah blah as it is.