Is divergence the open source weakness?

No one could deny open source has greatly impacted the tech industry in the last 20+ years. There is probably not a single web site you visit that does not run on open source in some way.

When it comes to code reuse, you can not beat it.

Yet its proliferation and ease of changing (forking a project) has also meant that for every solution/project there are many divergences.

Is this the open source weakness. Will consistent proprietary source win out in the end?