GitHub has some significant challenges ahead that are not mentioned in this article. As companies move to the cloud, they will run their own development ecosystems--SCM, CI, defect tracking, etc.--in their own cloud; and hosting services like GitHub and BitBucket will have a hard time competing. Already Oracle (and surely other vendors) are offering developer cloud instances that provide these services all wired together.
BitBucket is owned by Atlassian now. Stash is rebranded as BitBucket and while it has its issues, its integration with Confluence and Jira is at least as good as any of the other Atlassian integrations.
So if you're hosting your own tools, BB still gets paid and you don't have to switch vendors.
(my personal feelings about Atlassian rank somewhere between dislike and dread, but the BitBucket integration is one the least offensive bits).
