For me the main issue is about individuals. When it goes well and both parties want to do it, breastfeeding is good for babies and mothers (and dads, families and wider society too). When it doesn't go well it can be a living nightmare for everyone involved.
I would like to see every mother who wants to breastfeed (whether partially or wholly) supported to breastfeed for as long as she and her baby both want to. In my utopia no-one would ever say 'is that baby feeding again?', or 'isn't he a bit big for that now?'. Appropriate, well-trained support would be available to families when and where they need it. So, that would mean on-call health professionals in hospitals postnatally plus trained peer supporters on the wards daily (some areas do have the latter already). Peer support is very important, because it is different to health professional support. Peer supporters are really great at sitting with you, hearing your story, mopping your tears, inspiring you that it can really be done -oh and also supporting you without judgement when you're just done and want to stop. Once home, midwives should be able to visit as often (or not) as the mum needs in the first few weeks. Sod postnatal clinics in supermarkets! Breastfeeding groups with peer supporters should be accessible in all areas, and even better if they can do home visits too. The helplines already exist 
.
In my ideal world, all breastfeeding mothers would be entitled to regular breasteding/expressing breaks at work with suitable facilities to express and store milk if they want or need to.
In my ideal world, no-one would wonder whether it's ok to feed a baby in XXX place. Why wouldn't they? It would just be a given. (Note I haven't said what the baby is fed).
In my ideal world, mothers who don't want to breastfeed wouldn't. If they wanted to discuss it before their baby was born, then the opportunity for a sensitive conversation with an appropriately-trained individual with good listening skills and actual knowledge about breastfeeding would be there. BUT if that opportunity was not wanted then that would be respected absolutely and without question. Postnatally and once at home, mothers and their families would also be respected, and they would be helped to feed their babies responsively, given info about bottle feeding by appropriately trained health professionals and peer supporters (not by formula manufacurers), offered skin-to-skin, helped to manage any engorgement etc etc. Mothers' views as individual human beings would be respected.
I know people who didn't intend to breastfeed, but after their baby fed once after birth, they ended up doing it anyway. I also know people who decided to give it a go because of what they learned about it in their antenatal classes. They had never considered it because their mothers and friends and families all bottle fed. Some breastfeed for a short time, others longer. There is a role for sharing information antenatally. The key is then that everyone must get the support they want and need to feed for as long as they wish (hours or years, whatever) and to feel positive about that experience.
Saying the positives of breastfeeding shouldn't be promoted antenatally in case people feel guilty is a cop-out on the part of the Govt and NHS. If they actually upped their game postnatally then guilt wouldn't come into it. At the moment far too many mothers have horrible awful experiences of breastfeeding as this thread shows. Those people have not failed, or 'not tried hard enough' or 'not been determined enough'. They have just had a terrible time and made the best decisions for their families in the circumstances they were in. That's all any of us can do, and no-one should be berated for it. What's really sad, is that in some cases, with better support from the very start, those experiences might not have panned out that way.
Can't we all stick together and demand the services and support ALL mothers need postnatally without judging each other?