Hi there.
I know the problem with Blender was the GPL, but in the same fashion vray and Octane are integrated into Blender, maybe with the new standalone the Blender integration can be turned in a commercial addon, the export code may be open source, but as long as the render is produced in the standalone Corona there should not be a problem with GPL and having to give the Corona addon with open source.
And now if Corona standalone supports Alembic and OpenVDB (the latter in the future)and Blender supports Alembic (wich is on it's way) then the integration could be done using Alembic instead of OBJ's like right now because I doubt we can export a fluid mesh using OBJ's and get the correct render result or an optimal file size for an animation.
Blender is becoming more and more important (along with C4D and Modo of course) with people planning to leave Autodesk, and this is not only said by me but it's a trend that many companies are seeing, dev team I can give you my source about this trend, but in private to respect them, but I can say it's a big and important company in the 3d business and they are seeing this in their clients, also my Autodesk reseller told me that too...
What do you think dev team? people?
Cheers.