I've got 21 heavyweights beating current Wilder (at least) Oleksandr Usyk Daniel Dubois Agit Kabayel Murat Gassiev Tyson Fury Lawrence Okolie Fabio Wardley Filip Hrgovic Frank Sanchez Efe Ajagba Moses Itauma Joseph Parker Artem Suslenkov Jarrell Miller Guido Vianello Martin Bakole Justis Huni Arslan Yallyev Teremoana Teremoana David Surov (I do think he'd beat shot to pieces Anthony Joshua though)
I think Deontay Wilder isn't going to fight 21 more times in his career. So, you'll never know. But it looks like he's going to fight the #1 heavyweight on that list. And I pick Wilder to beat Usyk. And, really, Usyk is the only guy who matters at the moment. If he beat anyone else on the list, that person would just be labeled a bum by the people who don't like Wilder.
I think the best this version of Wilder can hope for is beating a shot name like Joshua, Whyte, Pulev. Or the likes of Makhmudov, Yoka, Dave Allen