Stackoverflow was still arguably the best offering at what it provided, but what it provided became obsolete. The need for a repository service is only growing.

It is not clear to me that Github's service has degraded due to incompetence, it also seems possible that they are just struggling to meet demand as the source code backbone of an internet in a critical moment of evolution. I'm not sure any single provider would fare any better.

> the way of myspcace and Oracle

Oracle had record revenue in its most recent fiscal year, with record user engagement. So whatever connection you're trying to establish between its fate and that of SO or myspace is off-target, both in terms of popularity and revenue.