One should not restrict the Ba role to only being a link between Non-It and IT or only for development projects.
A BA is someone who is able to bring in improvements, changes(technology, process, people etc.) in an efficient manner. So a BA could be part of the marketting team who helps the marketting team in providing estimates/high level solutions for a said project which is under the process of procurement. Or he could be someone involved during the REquirement gathering/analysis once the project is initiated. Or he could be someone who brings profit to the company by performing process improvement activities ROIs at process level.
Last but not the least BAs could be domain specific as well.

So it has a very wide scope though jobs under all the above mentioned sectors is not yet widely available in India.

Hope this helps.