I don't believe that Autodesk (or any of them) will be in danger of extinction right now, or anytime soon. However, pointing to any stock ticker, in a massive hot-running Bull market though? C'mon, don't do that.

Personally, I don't see world+dog heading for Blender, but it does have growth. Shops can dictate apps to an extent, but over time the talent pool has an equal amount of influence (...what, you can't hire and keep 50 sufficiently talented employees in your shop who are all fully proficient in Modo anymore? Well that sucks...)

Truth be told though, most pros are smart (and flexible) enough to be proficient in more than one tool (much like the same reason I'm perfectly comfortable in C/C++, Java, Python, Ruby (and Rails)...) You see, just like code, the base concepts are the same, the workflows are similar, it's largely the syntax, plugin-goodies and rules that differ nowadays.