What would you folks do if every competitor of yours in google was basically bought out by a single chinese company?
(To open up this thread a bit, maybe we should specify that all of ones competitors have been bought up by one company, and not refer to the company's country of origin?) Since it's just one company you're competing with instead of 300, it almost makes your job easier, depending on whether they have just bought the companies and absorbed them or taken over ownership of the companies and letting them continue to run as before. In your case, it sounds like you are going up against a Borg-like company. :)
In this case, all you need to do is figure out how to differentiate yourself against *1* competitor, instead of 300 competitors. It will depend on your industry, but there are almost always certainly ways it can be done.