It is expected that there should be a great vast of Farming Simulator 19 mods which will be re-created from FS17 version. This is possible because there are many players who would not like to miss their best mods from previous edition.
Even though it has not been officially announced that Giants Editor will include FS 19 mods converter, there are no doubts that FS17 will be added to the game in some kind of way.
Only one thing might become a boundary – as there Farming Simulator 2019 involves a different process for model texturing, FS17 converted mods may lack of quality and it’s not clear yet how these converted files will affect the overall game’s performance. It might happen that converted FS19 mods will look very bad and will not be a preferable solution for Farming Simulator 19 at all. However, let’s wait for the release – we’ll be able to see and test all features personally.