A Treebeard maquette in the new line might be feasible, but a PF? It would have to be nearly 4 feet tall to be in scale, and if it wasn't in scale, then the masses would be reaching for their torches and pitchforks.
Back on topic, I know I would buy an Ian Holm Bilbo PF, the perfection of the SSW statue notwithstanding, but I am pretty sure I will want a Hobbit version as well, once that film comes out.