I'd love to see OS4 release with all new hardware.
But I think a realistic option for those of us who are still happy to play with classic systems and software are these FPGA Amiga clones.
As our original hardware fails, hopefully in future, we will be able to buy replica amiga hardware in this form.
Five years ago, Commodore 64 enthusiasts never would have though there would be newly produced C-64 computers. Now they have both the C-One and the Commodore 64-DTV. Both are not only new implementations of the hardware, but offer EXPANDED features (in the case of the DTV, new colour and graphics modes).
When it finally becomes feasible to produce an Amiga in a joystick, someone will do it. Then we can hack it back into a case. Maybe one day it will be feasible to put the equivalent of an Amiga/060/RTG graphics/sound on a single chip. There's no reason why this hardware even has to be limited to the speed of the original 68XXX chips. It could technically be a 68000, but run at many times the speed of one.
While this isn't a path forward, it's at least a continuation of the classic Amiga line for those of us who like to use that.