In my opinion, the single most threat is the increased in competion and it is especially true for B2B Commerce.
Internet has brough multitude of suppliers in a single planform.
So, whether a supplier is located at Timbatkur or Honolulu can submit its on line price to a buyer, if he is permitted to do so. This was never possible with conventional technology. Moreover, with the advent of internet, transaction cost has lowerd and a supplier situated at remote place can communicate and exchange information or documents easily with multiple buyers. The companies in the US have to improve their cometitiveness by offering more value to their products than their competitors located at far place. The US companies can surely do so with their rich workforce and with tremendous technological advantage.