It's always a "chicken or the egg" situation. Right now, there isn't much need for a home router with anything faster than a 1Gbps port. In the prosumer space 10Gbps is available, but it's not super cheap (about $300 with SFP module). But, if something like 50Gbps becomes common, manufacturers will be incentivized to make products for it. The economies of scale and the effects of competition will kick in and prices will come down.

I'm old. I was at one of the events where Intel announced 1Gbps over copper. This was supposed to be impossible, there was no way to push 1Gbps over Cat-5 cables. But, with Cat-5e and Cat-6, they had cracked it. At the time, there was no way this was ever going to be a cheap technology and it was intended for large enterprises for major switch interconnect runs. Now it's everywhere.

Maybe 50Gbps to the home won't happen. And this is just some exec blowing smoke. But, maybe they'll do it and kick off the market for cheaper equipment in that class. While I do agree that we're lacking the "killer app" to make that much bandwidth to the home necessary. Things like music and video streaming came about after the advent of faster speeds. It wasn't until we had DSL that people realized that streaming music, in real time, would be a thing. We needed the bandwidth to be there for the use cases to be discovered.

There are a few router with 10gbps ports on the market, like asus gt-be98 pro. They don't actually run 10gbps since the processors can't keep up, but they do run well above 2.5gbps.