I hope. But I don't hold my breath before .NET 5. 3.0 is all about getting Windows Desktop scenarios to .NET Core. Not many of the people who require those would benefit from a cross-platform framework, as neither Windows Forms nor WPF would be portable. Avalonia might have the chance of becoming a decent option, but even working for an employer that provides GUI controls for various platforms it's too early to decide to try supporting it. And then there's the problem that Desktop apps are kinda dying out ...