You can define an interface with methods that allow objects to be processed in a more generic fashion.
I think that more than anything it would require a change of mindset that people understandably don't want to deal with.
As well as other options. [3]
I like to imagine that the "no generics, no way" crowd would never use the stairway in their building if the elevator broke down.
[0] https://github.com/clipperhouse/gen [1] https://github.com/cheekybits/genny [2] https://github.com/cosmos72/gomacro [3] https://appliedgo.net/generics/
Go's building architects decided an elevator was superfluous, as everyone should walk 20 stores high every single day, it is good for their health.