Hm... Making a circle to reach the starting point.

I would suggest another approach: let .NET Framework incorporate the useful features of .NET Core, and then eliminate .NET Core altogether as an experimental and dead-end branch. Thus stopping the segmentation and saving the technology for the greater benefit of customers. Somewhat controversial, but much saner approach product-wise.

Having said that, I don't think Microsoft has the balls to pull the compatibility tricks like this anymore.