It is always possible, and in fact PROBABLE, that people will eventually get the opposite gender if they have enough kiddos. If you look at the Duggar family, they had a run of B/G, a run of boys, and a run of girls that all were longer than most of us even have.
The reason why people sway is because most of us would like that to happen sooner rather than later and don't want to have to "Duggar it out". If you look at the statistics, we are getting about 80% with boy sways (meaning that some of us leading boy-friendly lifestyles may have been as much as 80% likely to have boys) and then 65-75% with girl sways (this can vary by what tactics were included while blue sways are pretty similar). So even though swaying is not 100% and never will be, to go from possibly 80% likely to have a boy, to 75% likely to have a girl, does seem to show that at least some of us are getting the opposite gender not because of luck or that we were "due" to but something really does appear to be working.
In terms of people you see/know IRL, there are lots of things that happen in people's lives that are swaying that may not be visible to the naked eye. People are never in the same place physically that they were with previous conceptions, there are just too many variables that come into play. People ~really~ did exactly the same thing with all their kids? REALLY? How is that even possible - answer, it's not possible because we are not lab rats in a cage LOL and even just having had our kiddos can affect our bodies in unpredictable ways.
My thinking is that if HT is ever an option, people should go that route instead because while odds of success with HT do fall off sharply over time But to my mind, if the choice is between swaying and just TTC naturally, then there's no harm in doing a laid back sway.
What I do want people to avoid (and this is truer of pink swayers than it is blue) is launching "the Great Sway of 2014" where your testosterone shoots through the roof because that really IS going to be worse for pink sways than doing nothing at all. Full explanation is here.
http://genderdreaming.com/forum/gend...ypothesis.html