I think there are 2 types of Note users. Ones who use the S pen, and those that wanted a larger phone / Phablet. At least that's been my experience. I've used my S pen, on the Notes 2 & 4, in all kinds of weather to boot, from various snow to drizzling rain. From -30C and up. Though the pen really doesn't like the cold for long. Hate using it when it's wet out....
Correct me if I'm wrong, but Palm used them, and blackberry did for a while. and then there was a long break before Samsung brought it back. The use of a stylus seems to be rare feature that comes and goes.
I don't really see Apple, or anyone else for that matter, jumping into that particular niche.. Not even sure Samsung is going to continue the line in the long term. As more and more phablets are released onto the market, the number of people who buy the Note for the Stylus may not justify them making a Note Series. (Hope that last part makes sense) Just not sure the numbers are there or if its a long term selling point for them....