Audi listed V50 T5 as A3 2.0T's primary competitor, even ahead of B200 Turbo. GTI's listed competitors are Civic SI and Cobalt SS. Totally different crowd. As much "class" as GTI, A3 is actually a classy GTI.
So if I've got this correct, you believe what the marketing gurus at Audi and VW tell you! What their statements say to me is that this is where in their dreams they'd like to see their respective products positioned since somewhere they have to convince someone that paying $3 - 5K more is justifiable. No wonder Audi would like to compare the A3 to the V50 T5. It is after all a grossly over priced Mazda 3 with a trick engine that Volvo is having great trouble flogging to anyone. In comparison, an A3 is good value but the GTI is an even greater value. Lets remember what the original GTI concept was all about, it's a slayer of giants on a budget. As such, the A3 is an orphan within the market place. If you like it's a GTI with pretensions to grandeur. Now if it had been an A3 2.0T Quattro for $3K more that would have been a different story.
As a result, I predict that unless the A3 2.0T gains that quattro drive within the next year, it'll disappear, particularly when it becomes apparent that GTI sales are considerably greater. When that happens watch how the marketing of the GTI will change. You too can dust off "classy" cars that cost $10K more and grin all the way to bank doing it.