That may soon change. According to The Times, Butler hopes to get his chance in 2009. Vadim Jean is attached to direct, and James Cosmo is set to produce. (Presumably, Butler might as well since he does have his own shingle now.) Most of the budget is already in place, thanks to Scottish Screen, and the remainder will be raised by signing 250 "subscribers" to the project. They're borrowing an idea from Burns himself -- in 1786, investors backed the famous Kilamarnock Edition of Burns' poetry, convincing the poet to abandon his plan to relocate to Jamaica. This year would also be the perfect one to film in, since its the 250th anniversary of the poet's birth.
I'd happily contribute, since I'm rather fond of Burns, Scotland, and period pieces (and ok, Butler himself) but I'm sure one has to be richer (and probably Scottish) to be one of the 250. So here's a bit of press instead, and best of luck to Butler, Jean, and Cosmo that 2009 is their year. Movie audiences need a little poetic education once and awhile.