Would you only buy one after your current rig dies?
That´s me. I would have liked an option "as soon as my Commodore Amiga breaks". I see the FPGA Amigas mainly as a way to take Amiga Hardware into the future. I don´t think I´d buy another old Amiga 3000 from eBay when mine breaks.
Also I´d like to see a board that can act as an AmigaONE and FPGA-Amiga at some time in the future - a machine that can run any AmigaOS software without emulation and run it fast. Ideally licensed in a way, that when the company making it dies, it becomes open source hardware and immortal.
Oh and of course it would be designed to have a real Amiga keyboard and real Amiga ball mouse and could read your old floppies.