It creates a push towards constant acceleration in all things- shorter release cycles, more product categories, etc. This supplies the continuous growth that shareholders demand right up until the point where it kills the host.
Also, "success hides failure". If you're a titanically successful corporation, any internal argument along the lines of "we shouldn't do X anymore, we should do Y instead" can be shot down with "well, look at how successful we were while we were doing X! X must not be so bad after all." It degrades an organization's ability to be reflective and self-critical.
These are problems for all successful companies, which become bigger and bigger problems with increasing success.