Multi-platform support (Windows, Linux, Mac OS) is very possible, especially as we are adding deeper integrations with the ethereum source code itself. Our Chrome extension was always designed as a test and first version of a multi-platform wallet. Eventually we hope to be on all major desktop and mobile platforms.
great to see this ann, i think we were waiting for it to be public so long time, and the cobinhood is good too, it can help
also you might get into consideration, some other even small exchanges which can help get more buyers and bigger market