You should keep on dreaming for this thing. The current liverpool's player wont be able to take down dortmund for sure. Dortmund beat tottenham which is much better than liverpool and actually liverpool qualified by getting some "lucky" opponent (manchester united) which has a very bad performance so far this season after spending tons of money
You cant underestimate Liverpool like that, there is still plenty of time to improve their performance and you cant forget the "klopp" factor in this match. Klopp knows Dortmund very well, so it will be an advantage for Liverpool. At least Klopp know the best strategy to play against his former team.