You are wrong, 2DS didn't confuse anybody and wasnt bad decision (despite ists not DS and dont have 3D), same would be with Switch Mini/Pocket, you have regular Switch but you would also had cheaper, smaller Switch Mini/Pocket just for handheld play, there is no any confusion.
Smaller and cheaper Switch Mini/Pocket just for handheld play is almost certain thing when 3DS dies (probably will be 1st Switch revision), if some people here think that Nintendo will relase onother seperate handheld platform thats not part of Switch, there are very wrong. People need to realise that Switch is unfided Nintendo platform, and that Nintendo will not have any more separate handheld and separate home console platforms, with that on mind Switch like hybrid device will have multiple different type of revisions with difrent price points that will all be part of same platform, something similar like 3DS has.
The difference between the 3DS and the Switch is that the 3D was, for most of its time, an useless feature.Thats why the 2DS was not an issue at all.The Switch capacity of switching between home and handheld form is another story completely.Its something far more fundemental than the 3D ever was.Therein lies the difference and why I believe something like the Switch mini will never happen.
And if price is an issue(since size is not a issue, given that people are more than accoustemed now to carry diveses that are larger than their pockets, and always carry some kind of backpack), when the 3DS is discontinnued, the price for a Switch will probably not only be in the range of 200 to 250(with used Switches going for lower than that), but they will also have good bundles.
Doesn't really matters, 3D was main feature of 3DS, not to mention DS screen form factor and design, and Nintendo ditch both things with 2DS. Why!? Because they wanted to offer 3DS platform and lower price point, and they know there will not be any confusion. Switch concept is difrent, but that doesnt mean that Nintendo cant relase smaller Switch at lower price point just for handheld play. And, there want be any confusion, much smaller price point (around $100 less than regualar Switch), much smaller box, point that cant be played at home on TV, while regular Switch will still be around $100 more expensive, big box, comes with dock and two detachable Joycons.
When 3DS dies price will be big issue in any case for Nintendo, beacuse 3DS curently has price point from $80-200, while Switch is $300, when 3DS dies Nintendo will need lower price point $150-200 instead of 3DS, and Switch Mini/Pocket will perfectly fit there, especially because current Switch isn't exactly most practical for people who prefer only handheld play (its biger and bettery life isnt great). Not to mentione that some same people intend to buy multiple versions of hardware, you have plenty of 3DS owners that have 2 ore more 3DS units.
Also you need to consider that Nintendo with revisions not that just only have different price points and offer different types of revisions that suits for different type of people, but they constantly busting sales evre new revision and extends life of platform. And like I wrote, oeople need to realise that Switch is unfided Nintendo platform, and that Nintendo will not have any more separate handheld and separate home console platforms, with that on mind Switch like hybrid device will have multiple different type of revisions with difrent price points that will all be part of same platform, something similar like 3DS has.
Switch Mini/Pocket actually makes most sense with all that on mind, and I am sure we will have one, and probably Switch Mini/Pocket will be first revision that Switch will receive.