The thing is, if your intention is offline only, the a ban has absolutely zero effect on you. If anything a ban would be better, then you can update your games and such freely, something you can't do with an offline only switch.
I don't think they should ban the eShop, and your ability to buy games ECT. However I agree, if you hack your switch your console should be banned from online play, period.
You are against online cheating, alot of people hacking are not. Furthermore, the ability to go online and cheat has a strong appeal to those knowing they can with no consquences.
Nintendo, and every other game company has proven, it's not that easy to always catch online cheaters, or prove they are cheating. The easier way, would be to just stop it at the source, if the console has the means to cheat, it isn't allowed online. I think a better option would be a block, that prevents online while the console is hacked, and if returned to stock Online returns (without the previous save files OFC)
Of course that opionion will fall on deaf ears here, half the community are self admitted cheaters. Whether they feel doing things like hacking Pokemon are cheating or not, not relevant it is, and most here partake.
BTW I am Pro hacking, Anti cheating, and own 2 switches so I can hack one, worry free. I will gladly allow them to ban mine, shoot I may even write CS and say ban this please. Then I have no worries about going online to update my games ECT.