Those people wouldn't be handheld gamers in the past, because before Switch there was no such thing as a high quality open world RPG on a portable device. You cannot draw a definite conclusion that they have no interest in portability when we haven't had a scenario for a proper analysis yet.
I asked you for an estimate. You proposed that Nintendo should cripple their Switch marketing message in order to appeal to such gamers. You took issue with me saying that you are unreasonable. You kinda have to throw out a number to have any sort of argument, but I suspect that you begin to realize that your proposal didn't make sense. You'll be either stuck with a number that is too low to justify the obvious drawback of your proposal or you'll have a number that makes you prone to get ridiculed.
You can't assume that everyone wants to play on the go, just because their wasn't such games in the past doesn't mean they would get a handhed
How is it going to cripple the switche's marketing message, they should just simply announce that their is a seperate bundle, it doesn't needs adds or marketing. You're forgeting the millions of gamers on the internet who are exposed to gaming news every day through youtube, social media, and forums.
My proposal makes perfect sense, i'm not a statistical firm in order to throw out numbers for you, and my proposal has no drawback at all.
The sale numbers of the pro controller alone show that people do not want to play using the joycons.