is a multi-reprogrammable PCI-E x16 slot user-reprogrammable FPGA possible?

I think this would be an amazing leap forward for emulation.

all youd need is a device which plugs into a PCI-E slot in either a standard or SLI pc (if you want a GPU, have to sacrifice a PCI-E slot for the new FPGA coprocessor unit)

all the video processing could be done on the chip and output like a youtube video over the GPUs video output, leaving all the CPU/GPU free for screen filtering/shader effects (crt emulation with no overhead at 4k/1440p maybe?)

as long as it was well documented for programmers, it could be expandable to emulate every classic console and then some -- even leaving old PC hardware or any other thing the FPGA could emulate in any possible reality being an option if some coder thought of it.

After that, the user would just have to run a precompiled .exe which would feed the FPGA reprogramming information about the gates, and switch them on-the-fly through driver software.

it could come with multiple cables that connect to cart connectors instead of video outputs for dumping roms or also playing games off an actual cart with controller like an analogue NT-Mini

it also could come with analogue controller inputs just like on a regular FPGA chip, and since its feeding the monitor information as if it were a prerendered video, there would be no visible input lag at all.