That seems to be done better by a plethora of other pokemon; Jaroda and Erufuun are just 2 examples I can pull up.
Venasaur does gets Chlorophyll so he has some use over Jaroda in that respect.
for teams using Saur for a sunny day team it has many problems. relying on a solarbeam sludgebomb combo of atks is not a great choice being its walled off by basically anything with a steel typing. not to mention other teams that run weather afeecters like Ttar,abamasnow, and even politoad. if this happens venasaurs solar beam is already nerfed. this is why it most likely will reamin UU.
Remember kids, this an example of why we always read the thread before posting.