CEBR should go out of business

I don't think that's necessary. However, if their entire business model is making predictions like these, which are almost never accurate, then they probably should.

  Should Bloomberg stop reporting this type of thing

Maybe, if their "reporting" amounts to an advertisement for CEBR's product without an ounce of critical/additional input. For instance, they could try something like:

  "projections like CEBR's have been made in the past. Most recently, [CEBR-like org] predicted China would surpass U.S. in 20XX."