But would there be any point at all supporting PCIe?
The existing bottlenecks due to the Amiga expansion bus (as detailed above) make it pretty pointless.
PCIe would just cost a lot more with each port being seperate from the next, whereas PCI being a bus must be a lot easier/cheaper to do.
Just about any old PCI card is going to be vastly bottlenecked by the Amiga itself so why bother with PCIe when the cards are only just becoming available and VASTLY too powerful to be much use in the Amiga anyway?
I would much rather use PCI cards if I were to ever tower my A1200. I would just stick an old S3 Virge in it or something (assuming I could find one, not sure if I threw em out years ago).
PCI cards that are perfectly fast enough for the Amiga can be obtained for free as they would be considered retro for PC.