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More and more individuals are doing such screening, and my guess is that will actually have a worse effect than no screening at all, since it will tend to produce very similar people in the long run by selecting for a few specific attributes. But no intervention at all doesn't work as I explained before due to lack of any selection.
I kind of agree, but what would actually happen if there is no screening? Such a large number of people will become such a burden on society it will not be able to sustain them? If that was the case then natural selection would come back into play as anarchy took over. If you do screening and mess it up then a disease could come along and wipe everyone out. The lack of gentic diversity could have serious consequences, we need alternative thinkers who verge on insane. Either way its pretty much the same outcome. I'm not sure you can really say (at the moment) that given the big picture it would be a good idea to do anything, or ever do anything, over doing nothing.