Here are the top teams who will be competing at Worlds 2008, and their Total Scores so far this season:
202.39 Savchenko/Szolkowy, Euros
199.23 Savchenko/Szolkowy, GPF
196.96 Zhang/Zhang, TEB
192.68 Zhang/Zhang, Cup of Russia
191.20 Zhang/Zhang, GPF
190.64 Savchenko/Szolkowy, NHK
188.63 Savchenko/Szolkowy, Skate Canada
186.93 Pang/Tong, TEB
185.95 Savchenko/Szolkowy, Cup of Russia
185.13 Pang/Tong, GPF
181.71 Kawaguchi/Smirnov, Cup of Russia
179.82 Mukhortova/Trankov, Cup of Russia
176.75 Pang/Tong, Cup of China
174.20 Dube/Davison, Skate Canada
173.26 Dube/Davison, Skate America
172.43 Dube/Davison, GPF
169.82 Mukhortova/Trankov, TEB
165.19 Pang/Tong, Skate America
165.19 Kawaguchi/Smirnov, Skate Canada
161.75 Kawaguchi/Smirnov, GPF
160.21 Dube/Davison, NHK
Dube/Davison's best-scoring event was Skate Canada, and they scored under 175 there. While many of the top teams improved their scores as the season went on, D/D did not improved and may have even slipped a little.
It appears that a minimum score to make the top 3 at Worlds would be 185+. I am not sure Dube/Davison can make up 10 points just by skating cleanly. They are quite slow compared to the top teams and they lack the big tricks the German and Chinese teams complete with a fair degree of consistency.