Lol. Decentralization vs. big blocks, were you around in 2017 and did you actually understand what the whole debate was about? Yes, let's create a second Bitcoin SV with 2 GB (or 275 MB, doesn't matter) blocks, but with quantum safe signatures ...

Using Segwit or not is a tiny detail. I think even Lopp has written about that possibility of a change in weight. Hash-based cryptography like SPHINCS+ would be a stronger argument, as some devs have stated that it may not be safe enough.

About Jameson Lopp's conflict of interest, I have no idea about that, but honestly I would not be surprised if there was one. But a BIP should be decided upon by strictly technical and game theory related reasons. (Yeah, my remark about the "Bitcoin.foundation" may conflict a bit with that, but it simply doesn't look good if you try to pretend to be someone who you aren't. I guess for these reasons this "BIP" has got not much attention.)