I can't find evidence it really made it out to consumers, & even less evidence there was any followup, but Intel did have a Xeon + Arria 10 GX FPGA chip, back in 2018: Xeon Gold 6138P
with Arria 10 FPGA.https://www.anandtech.com/show/12773/intel-shows-xeon-scalab...
At the hyperscaler level there's been a lot of adoption of SmartNICs, which are often FPGA based. That makes me feel like there's a pretty big market here already for integrated FPGAs. I think the other requirement is that these FPGAs need to be made broadly available if we're going to see a real shift. Selling a couple many-thousand-dollar high end chips isn't going to create new audiences clamboring for these things, which is required for the tech to actually get interesting & well adopted, instead of existing only in a small but important niche.
Size, speed, features. You can have a small FPGA for about 2$. You will however be limited in the complexity of the design you can implement because it has limited gates and pins. And limited speed. Like normal processors if you want faster, bigger and more features the cost shoots up. Combine that with the limited market for big FPGA's and they can be very high in price.
Mind you that many also have things like a multi core ARM processor on board since many designs need a processor to control the circuit. Same with many interfaces. Would be a shame to use the limited gates in the FPGA for standard things like that.
At the hyperscaler level there's been a lot of adoption of SmartNICs, which are often FPGA based. That makes me feel like there's a pretty big market here already for integrated FPGAs. I think the other requirement is that these FPGAs need to be made broadly available if we're going to see a real shift. Selling a couple many-thousand-dollar high end chips isn't going to create new audiences clamboring for these things, which is required for the tech to actually get interesting & well adopted, instead of existing only in a small but important niche.