Financing, mindshare, education, use cases in the industry. All of these things feed to one another. The bigger Blender gets, the easier it gets to get bigger.
At the core it’s building a tool that people can use to do their work in an efficient and enjoyable manner. To build that tool Blender needs developers, and artists collaborating with those developers.
It’s how any startup grows big: pick a niche, be the best at that niche, expand into the next niche. Ebay, Facebook both started by being the biggest fish in a small pool. Once you have a solid userbase you can leverage further.
What’s the niche? For me as a game dev, personally? Indie dev, scripts, customizability in Python, freedom from licensing hell. There’s does exist the problem with GPL where you can’t really integrate things like Allegorithmic Substances or other such closed source packages into the software.
The core question to seems to be what niche does Blender serve? Can it etch out more room in a market in which new indie products are coming from every major development house.
Both games and CG made movies seem to be a growing markets, so that certainly creates more opportunities for growth.