Takara MP-10 had been out for a fair while before the Hasbro version was released as well. That didnt stop them flying off shelves. Also the Hasbro version is significantly cheaper in both cases (OP and Soundwave) so there will be many, like a large portion of board members here, awaiting the local release.
Also I can't ever recall a case where a TF KO release has significantly affected the sales of the genuine item.