No it hasn't. The original 'hygiene hypothesis' has been debunked many times over.
It is now understood that the majority of viruses should not be considered "safe" to catch as it does almost nothing to improve immunity and actually makes the immune system worse and can lead to development of allergic disease. This includes illnesses that people usually think of as "normal" and "typical" such as colds and GI viruses.
Bacteria exposure is what primes ones immune response. This includes vaccines.
The danger of oversanitizing comes from skin and lung exposure to chemicals which can make one more susceptible to infection; for example using so much hand sanitizer that your skin cracks open leaving vulnerable spots for bacteria to get in. The point is it doesn't have anything to do with being "too clean."