What difference does it make how they got together? You think that Motown groups were never put together using similar criteria? Who cares? Some men meet their wives at a night club, some through a dating agency. What matters is whether the relationship works. We are just more aware of the manufacturing process today than people were fifty years ago.
Lack of alternative? Rock and pop groups and bands are forming/being put together all the time and the ones that make it are, by and large, the ones that the public like. There were alternatives to Take That and still are. Are you honestly trying to say that people buy Take That records because there is nothing else in the shops?
I agree about these types of group being manipulated and manufactured but that doesn't necessarily mean they're not a legitimate product. They might well lack many of the qualities of a 'real' band but they still do a job.