is mozilla missing out on the scene of desktop app? what's next after xulrunner? Also, i have a legacy app written with xpcom like components. Is atom shell a

is mozilla missing out on the scene of desktop app? what's next after xulrunner? Also, i have a legacy app written with xpcom like components. Is atom shell a right platform if i decide to re-write the old xulrunner based application with new platform such as atom-shell, node-webkit or qt may be? Are there any licensing issue with atom-shell for desktop apps?