superchunk on 25 August 2017
So looking at your specific definition of console revision, the I agree, Switch won't be altered.
However, I do think that like MSony have demonstrated, we'll see power/functionality upgrades within a couple years. I doubt that will include significant form factor changes (i.e. no slim model) but I'm sure there will be changes here and there (i.e. better kickstand).
I'm betting that by 2019 we'll see a more powerful Switch.
+ ram
+ CPU/GPU power
~ same battery life, screen, controls etc.
Then around 2021 we'll see a "generational" like change where form factor may also take a modification to some extent.
I don't think this is any different than how MSony will continue to behave with their consoles. Every ~2yrs we'll see something new.
