Truth be told, nobody cared about the Expos when they were there. Nobody cares that they are gone.
I was once in Montreal for a conference, back in the 1990s, and one evening didn't have anything to do. It was a rainy evening in May and not good for sight-seeing. Afterwards I realized I could have taken the subway to the Expos game (covered stadium). Now I'll never have a chance to see the Expos play a game live.
Not exactly something I stay up at night lamenting.