This is why Microsoft doesn't care if people pirate Office tools for private use, because if they get to a position where they can decide what tools to use for a company, they'll pick what they know. Office.
The same works for Unity, if an indie company becomes a AAA level studio, they'll use what they know and what they have been using for years.
Now there's a risk that it'll be something that's not Unity.
This is why Microsoft doesn't care if people pirate Office tools for private use, because if they get to a position where they can decide what tools to use for a company, they'll pick what they know. Office.
The same works for Unity, if an indie company becomes a AAA level studio, they'll use what they know and what they have been using for years.
Now there's a risk that it'll be something that's not Unity.