I would temper this with two observations:


1) Honey Bees are native to Europe - unless you want to consider them immigrants from African/Middle East,
2) Modern research concerning the interactions of honey bees and 'native bees' don't necessarily support the honey bees are bad, native bees are good.   Sometimes a bit of competition has unexpected benefits.
3) Pollination is pollination - the current plants don't really care whether the pollinator is native, non-native, managed, or unmanaged.   The next generation of plants will reflect the benefit of pollination.  
4) I well understand that some native pollinators and plants have very specialized relationships -  but those the require a very specific fit probably won't see much impact from honey bees.  However, the plant community in a wild setting needs pollinators to thrive.


My point, which is overly simplistic is actually a critique of cherry-picking literature to support a 'sky is falling' hypothesis.    Can there be adverse impacts from over-stocking - of course.  





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