I am confident that the support will come because it already has in different contexts. It is free and owned by you. Linux is more reliable and modular, which better suits industrial work. The same application can run on a tiny SoC, a PC, or a huge Beowolf cluster. The graphical user interface is optional.
Real time is available in several flavors.
You can customize and optimize Linux. Everything you need is there and free, which means you write less code. You have the full source code for reference and the community for support. And thousands of open-source applications means far, far less reinventing of the wheel. There are no royalties or license hassle.