Fences 3 was released about 14 months ago in response to Microsoft's release of Windows 10.
It is a safe bet that Fences 3 will be supported [current] as long as Windows 10 is essentially as it is now.
However.
Microsoft's 'idea' that Windows 10 is to be a final version of the OS means that although the name remains the same the OS itself is constantly changing.
If or when the OS is changed by Microsoft dramatically enough to cause major issues with shell enhancements [ie. Fences] then Fences may too have a dramatic revision [new version release], and that is entirely up to Microsoft as far as timing goes.
Thanks to Microsoft the definitive answer is.....not in the foreseeable future - ergo for quite some time to come...