i hope someone will build a thingiverse like site where you can upload any model design and order the necessary bricks to build it.

there won't be a trademark issue for the brick producer, as they are only delivering an assortment of bricks. the model design comes from elsewhere.

trademark may be enforced against uploaders of protected designs, but that is no problem as the design can still be shared elsewhere and it can't outright prevent anyone from ordering a certain assortment of bricks.