I think that Samsung will not discontinue the Note Series. This is due to the the fact that this series is more than simply the support of the S Pen. It also makes refinements in the features and design of the S Series, with the addition of S Pen(also seen during the launch of Note 20 Ultra)
If the Company is thinking of discontinuation of it, it should not.
As it will will do two things. One, the Company has a series (S Series) on which it can implement new features and/or design. And 2nd, it can also improve these implementations according to people's views on S Series, on the second series (Note Series).
I don't think samsung will discontinue the note series because they said officially that we are just spreading the support of spen because many people like it . And this is confirm that will we see a next note 🙂.