I don't really think so, whilst Dortmund are a very decent team, i think you'd be asking too much of them to eliminate Chelsea in the RO16 stage in the CL, i know Chelsea are not in their best moment currently, but they remain a powerhouse in the CL, and are one of the strongest teams in the tournament. Mind you also that this round of fixtures will be played next year, after the WC, so quite a lot could have changed for Chelsea in terms of team momentum and morale, and they could prolly be back to the same Chelsea that we know, i'm afraid i think Chelsea are winning this tie all day long.