Be extremely conversative about bumping the minimum supported version of ReactiveUI and any dependencies such as splat or system.reactive. Please ensure that you aren't breaking the ecosystem, there's a migration path and no rift is created (python 2 vs python 3) that people can fall into.
With that said however this is an open-source project and typically folks who are stuck on older versions work at enterprise companies. Maintainers have zero obligations to requests from this demographic - our software is made available in binary and source form on a AS-IS basis. Often we will accomodate such requests to keep a platform around longer if the request comes from a maintainer or a respected community member who is actively engaged in helping make ReactiveUI better.
The two deciding factors maintainers should use as a rule of thumb are as follows:
- What is the min version of a platform shipped by Visual Studio for Windows? (ie Help -> Xamarin -> Release Notes)
- When a new project is created by the File -> New project wizard what version is in the csproj?