For anything else that is more of a replacement rather than supplemental (like going from Node to Deno), I'm not sure if there is a great adoption path. Going for the full application rewrite is usually not a good idea because it may take a while, cost a lot, and there is no guarantee that the code or system will be any better off than it is now. Doing an incremental adoption also has its issues because you have to develop new features in the new system while maintaining and deprecating things in the old system. Depending on how monolithic things were in the old system, it may be time consuming to get the two to play nicely together or get to feature parity.
I think the thoughtful adoption path for anything is asking: why? Is there something wrong with the existing system that it will solve? If not, stay on the old system until it makes good business sense to think about adopting something else.
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