There is already an example of such a software (minus mouse broadcasting which is planned for next major version) but sadly limited to French language friendly folks. It's called MoW. Very popular within the French-speaking wow multiboxing community, mainly because others solutions lack non English translations & tutorials or even support. A video tutorial shows how to get it up and running in a few minutes. An user provided a tool which adds easy FTL functionality to the software.

My point is, of course there's always room for new solutions, all you need is to find a niche where your software can fits in. It will eventually grow from there.