Britain's Got Talent but does it last?

Next Saturday sees the start of the new series of Britain's Got Talent and the big question is will there be an act to make lasting impact. The only one that could be said to have done this is Susan Boyle and she did not even win. If you were stop people in the street and ask them to name 5 winners and they might get Paul Potts, Diversity and that dancing dog that was in the badly reviewed film, other than those 3 you might struggle to get an answer. Will this series provide someone with a lasting career?