No one can be sure of anything yet. Even Nintendo is still weighing the options for upgrades, according to the article.
As for small hardware changes to counteract piracy, those happen pretty regularly with consoles. But such changes wouldn't be "a way to maintain sales momentum" as this article indicates. That's something only a new or revised model could do. Anyway, two years into the console's life, it's pretty easy to guess at an "xl" version of the Switch on the horizon, particularly given Nintendo's handheld history. Lower cost for the base model, slightly better screen, slightly better performance for the "xl" sounds about right to me.
Personally, I think any slump in sales for the Switch are more likely to be software related than sticker shock. Because aside from Smash and Pokemon, there's been a dearth of major first-party software announcements. Hitting 2017 running with 2 amazing first-party titles was a great move that clearly paid off on the interim, but the long view has been looking spotty as a result -- hence slower sales. You can tell from the past few Directs that Nintendo has been leaning into their growing third-party lineup (I mean fuck, it finally happened for them!), but those are at best appetizers while most of us wait for more main courses to be served up.