We can only speculate about Autodesk and their plans for F360, but the free version has been in existence for seven years now, and I would think its continuing existence and use has more pluses than minuses for them. It costs them almost nothing to support us and we contribute to the development by engaging on Autodesk's support forum. It is a recruitment tool. A fraction (only Autodesk knows how many) of users try the free version, like it and convert to a paid licence. Another fraction do commercial work using the free version even if they shouldn't, but Autodesk have tuned it very carefully to make that difficult by limiting the import and export file formats, limiting the CAM features, etc. There are workarounds to many of the imposed limitations, but they take time, and time is money in commercial work. Soon you're losing more money that way than the cost of a licence. We advertise the product by discussing it on forums like this. Thanks in part to us, F360 probably has the best brand recognition of high-end CAD systems. If they were to close down the free version, they would drive many of us away to their competitors.
Despite appearances, I'm not an apologist for Autodesk. They are a very hard-nosed company with a laser focus on their bottom line and they will have done a cost benefit analysis of the free version. Circumstances may change and they may kill it tomorrow. I just don't think that's very likely.
Nick