Even Binnington barely makes the cut at 29 y/o. So basically there is no next generation of Canadian goaltending...
Someone random will probably emerge at some point, as there is still a plurality of Canadian Goaltenders in the NHL. If the NHL players do go to the next Olympics, you only need 1 guy anyways so it's probably not overly dire for their presumptive chances.
Looking at last 3 drafts, Canadian Goaltender
2020:
Nico Daws - 3rd round pick
Dylan Garand - 4th round pick
Will Cranley - 6th round pick
Garin Bjorklund - 6th round pick
Remi Poirier - 6th round pick
Devon Levi - 7th round pick
2021:
Sebastian Cossa - 1st round pick
Benjamin Gaudreau - 3rd round pick
Tristan Lennox - 3rd round pick
Talyn Boyko - 4th round pick
Gage Alexander - 5th round pick
Joe Vrbetic - 7th round pick
2022:
Tyler Brennan - 4th round pick
Mason Beaupit - 4th round pick
Cameron Whitehead - 4th round pick
Ty Young - 5th round pick
Emmett Croteau - 6th round pick
Dominic DiVincentiis - 7th round pick
and there are obviously guys older than that in the AHL, plus the chance of someone in the poll taking a huge leap. I'm not too familiar with the pipeline of junior players that haven't hit draft eligibility yet. The bolded guy is the only one who was drafted in the top 2 rounds from the last few drafts, but the sheer raw numbers means someone at least should be suitable even if it's basically throwing a dart randomly at the board.
But if you were taking betting odds of who would be the Canadian Starting Goaltender for a hypothetical 2026 NHL player Olympics, it'd be a huge pile of "who the heck knows"