Mono is not dead, .NET needs it for iOS, android, wasm and some other platforms. In fact it's being merged into .NET 5. I don't know know if the meadow team plan to migrate to .net core because Mono's AOT compilation story is very mature while .net core doesn't have one yet (apart from CoreRT, but Microsoft doesn't seem to like it very much)
Meadow can run .NET standard 2.0 code which covers most of nuget packages.
Mono is not dead, .NET needs it for iOS, android, wasm and some other platforms. In fact it's being merged into .NET 5. I don't know know if the meadow team plan to migrate to .net core because Mono's AOT compilation story is very mature while .net core doesn't have one yet (apart from CoreRT, but Microsoft doesn't seem to like it very much)
Meadow can run .NET standard 2.0 code which covers most of nuget packages.
Ok, maybe I skimmed their docs too quickly. Missed that it was Mono, it looked like it was .Net MICRO which is... mostly dead.