Reasons why I don't think it would put people off initiating breastfeeding (for Aloha!): because it was nothing to do with initiating breastfeeding. The 'unusual' element of breastfeeding for years was presented precisely as that - very, very unusual. There was no suggestion this was something that was part and parcel of bf for most people.
Of course, if people have a closed mind to bf, and think it is disgusting, unnatural, they couldn't do it, baby hanging off boob, partner thinks it's rude, formula is just as good, why bother with the hassle blah blah blah and all that sort of stuff, the programme will not have changed their minds one bit, and may well have reinforced some tw*ttish attitudes such as the peedy-fiddler man's.
People who do want to breastfeed or who are open to it won't have been put off, and may well have been encouraged to feed a bit longer than the regulation x months, too, as feeding toddlers looked absolutely ordinary compared to the seven-year-old
I think people who are open to it may have been put off bf a seven-year-old if it had ever occured to them.
I have just watched the repeat of Richard and Judy, and I thought it was just fine - Richard was less idiotic than usual, and R&J both posed sensible questions with were answered sensibly and with good humour by the two mothers in the studio, who were both home schoolers and one of them didn't even own a TV - shock horror