BMW has been doing turbos for a while, so they're not "resorting" to turbos to keep up, they're simply revisiting a technology they mastered a while ago. BMW has some of the most famous and impressive turbo motors and cars of all time.
Also, 330hp stock is plenty for a TT car. I'd like to know what the 2JZ-GTE made from the factory, or the RB26dett.