The short answer is, depends.
The Lumia series as a whole doesn't support USB-OTG. Those that don't, never will. We've been over that and it is a hardware thing. (whether you believe that or not; isn't going to happen)
As for a chance in the future, that depends a bit on whether you believe there will be more "Lumia"s. (brand name) It also depends on whether you believe the capabilities of USB-C which provide many of the features that make USB-OTG attractive, should be labelled as USB-OTG or not. USB-OTG is a specialized version of USB that can act as a host or client port. The ability to do that is inherent in USB-C, it is not a specialized variant.
The question then becomes if future devices that run Win 10 Mobile will have OTG. That depends on who is making them. That is a feature that may or may not be included if they choose to use a legacy micro (mini?) USB plug.
If the device has a USB-C connector, it should, by default, support all those things you want OTG for, connecting to drives, mouse/keyboard, audio/network dongles, etc. It also supports video which OTG doesn't.