I really doubt people will start collecting $1000 notes just because they’ve lost legal tender status.
Its possible the “buzz about the 1, 2, and 1000 dollar notes” is good for the hobby but I doubt it will have much impact. I feel it is more likely that this news will fly under the radar of your typical Canadian and if that person has a hoard of $1000 notes I really doubt he or she will go out of his/her way to acquire any new CDN notes.
As far as us “die-hard” collectors go: does it really matter? Do we really care about book value of common notes? Do the majority want to go out and acquire a $1000 note just because they’re no longer accepted at a store? Will some people who have the $1000 notes hang onto them and start collecting? I would bet the answer would be “no” in most cases. I know I haven’t changed my stripes. I still shy away from collecting denominations $100 or higher. And in my last check on eBay I’ve noticed a surge in listings of the latest $1000 note. It may be possible that a few "dabblers" decide to hang onto the $1000 but not sure if they would transition well into a bona-fide collector...
A friend told me she had a $1000 note a few years ago and she revealed the information like it was a pure brick of gold she was offering me for less than spot. I asked her about it but she couldn’t really give me any information other than it had the queen on it (so it was 1954 or newer). When I told her it was probably worth $1000 she cackled at me like I was off-my-rocker. I quickly changed the subject because I had no interest in acquiring that note.
So, I would wrap up by saying that the removal of these denominations (as legal tender) will likely have little impact on the hobby (in terms of what people collect) other than perhaps (& hopefully) drawing a few more into our community. Hopefully, the new Viola Desmond $10 will draw in new blood too. I have to say that the introduction of something novel (a vertical portrait of a revolutionary Black woman) may drum up more interest than the news of the $1, $2 & $1000. I’m sure most here would be happy to welcome some fresh faces into the fold.