malayalam cinema

I don't think so, they don't do that when they get a chance to work in other languages why should they reject it. Offcourse they think that they should become popular. Moreover cinema is not at all a restricted place and there is no such rules that they should stick to only one side. What about Mohanlal, mamooty, Jayaram, Sureshgopi, they are all still famous actors in Telugu and tamil.