The trouble with updating to the 21st Century means pretty much abandoning the past, but the Amiga is about retro, so you can't abandon the past. It's a dilemma. What you need is to build a new Amiga on top of (say) Linux to save having to write all those networking, memory management etc.
There's no money, no programmers and not market. It ain't gonna happen. Enjoy Amiga for what it is, a trip down memory lane to a simpler time.