Wiki says:
On the Unfortunate Events website, the question "Are you going to make another movie?" is asked and Lemony Snicket replies: "It is known to only a handful of people whom are currently bound and gagged and locked in a cupboard. However, should it be of any use at all, I can tell you that one of them is known as Lethal Verity Sky". Lethal Verity Sky could be an anagram for "That's very likely".
If another film were to be made, however, the orphans' actors will most likely need to be recast, as the children have grown out of their roles.