Hehe, I get why you feel that way, @lemouth.
I also had the "what? Only 1-2 %?" feeling, but I kind of get why they are doing it slowly. The Lego Group is a huge company, and changing the basis of their entire production is a huge undertaking. I guess it is very difficult to even get their hands on as much bioplastic as they even need without promoting the building of new sugarcane farms.
I just hope they keep their promise of increasing the production steadily until 2030 (when they plan to be 100 % "green").
Yeah, let's have faith :D