The rivalry between the prairie provinces is very strong and spirited. However, because we're both prairie provinces, I think we both tend to support the other team if our team is no longer in the running. As much as I've cheered loudly against the Riders whenever they're at IGField, I have supported them whenever the Bombers are out of the playoffs. If the Bombers make it to the Grey Cup again as projected, I expect the Mosaic crowd to actually be like a home crowd and not just because of the fans travelling from Winnipeg, imho.
That and the Bombers played the RoughRiders in Regina, in the western final in 2019.
I don't know how many Rider fans will be at the game. Judging by the last 2 regular season games the crowds where pretty thin. I'm guessing a lot of them are selling off their Grey Cup tickets as we speak.
Being from the west, I've always cheered for the western team. If the Stamps or Lions beat the Bombers in the western final I'll cheer for them.
I remember back in '91 the first Grey Cup game held in Winnipeg. Calgary vs Toronto. Back then the Argos where owned by Bruce McNall, Wayne Gretzky and John Candy. When the Argos stepped onto the field, they got booed. Gretzky and Candy are looking around wondering why their team is getting booed. Eastern team playing in the west.... your gonna get booed.