Some good points.If one of my bands (we played in obscurity in bars for a few years) had kept at it for 40 years, and the drummer died, nobody would be running around saying "you shouldn't play your music anymore". However....somehow, if you get famous doing your music, and millions of people like your stuff, you've signed up to some bizzarre death cult pact where you can't do that? That's silly.
If you don't want to attend the concert, you're free to do that, but saying that an artist can't perform their work that they've created over their whole life anymore is stupid.
There are all kinds of randos performing as Deep Purple and Yes and countless others. Nobody is going to see any Rush show without expecting a different drummer than Neil on account of him being dead and whatnot. I don’t think that would negate Alex and Geddy from playing their hits. And why should it?
Nobody guns Billy Shears for playing old Beatles covers.