2020

I think you need strong software to go along with the price cut, but I would also like it if Nintendo did it April/May for Japan.

If rumours of a remodel are real, I doubt they’ll cut the price of the current switch model anytime soon. I’d take a punt and say the remodel (if it exists...pretty sure it does) will launch with next years heavy hitters ie animal crossing, the real Pokémon game (if it’s launching in 2019) and Luigi’s Mansion 3, (not sure if that’s a heavy hitter but likely to be kinda popular) all of which I would take a further punt and predict will arrive toward the end of 2019...so I wouldn’t be surprised if the redesigned machine launched around then.

Knowing Nintendo, they are more likely banking on a remodel (which they can treat as a relaunch) rather than a price cut to create a second wave boost to switch momentum. I’m assuming the new model will either be repriced or seem like better value for a similar price. So, yeah...

The demand is still very high. I dint see it getting cheaper soon.
But releasing a mini version with joycons attached (I think the costs could decrease a lot without a detachable joycon) and outputting only on HH mode even if plugged on TV (the system is build with restrictions of eventually be used on dock, with higher clock and cooling capacities, ditching these capabilities helps the size constraints of the system) would be a great opportunity. mid 2019, 200$.
Launch also an official mini dock that work for both versions of switch. 50$, with cable already.

Drops for the regular switch only in 2020.

I wonder how much of an affect would new foreign trade policies affect hardware prices.

Even during the bubble burst and the inflation during the late 2000s, the 7th generation consoles were selling really (even the PS3 did respectively well despite a bad start). Though I guess Sony and Microsoft sustained losses during the 7th generation due to HD development being relatively new at the time and Blu-ray adding to the costs for the PS3, even though it was the cheapest option for a Blu-ray player at the time.

Personally I would have given it a price cut this holiday for an extra push to reach that 20 million goal, but perhaps Switch still doesn't have enough word of mouth popularity for something so bold. I expect to see one in late summer/early fall 2019 or wheneverthe launch of the redesigned version will be. If sales wane too much early in the year or if they release the revision sooner, like spring, then they may do it late spring.

What Rol said sounds solid too, but I think this revision is also going to be for younger players, not just females. I expect colors to be a big thing and possibly nondetachable or simplified controller connections for ease of use and more durability.

Nintendo don´t need to do a cut price for its best selling product. 

¿Why are they going to do this? Nintendo is not bigger as playstation or xbox. They need reneuve from hardware. Actually, Nintendo Switch has no competence at all. There in not any hybrid console in the market at all. So, the answer is not before 2021. 

Nintendo will not drop the price before momentum starts to slow. Next year comes NSMBUD, Animal Crossing and Pokemon, so momentum will rise. No price cut in 2019 (although Black Friday deals or something like that). What I can see is at constant price a bundle with a game or a new model. But no price cut in 2019.

Actually I think we will definitely getting some kind of price cut or at least lower price point revision before Pokemon launch. Most past Nintendo revisions or price cuts were timed just for release for Pokemon, Nintendo simple want that more people buy consoles in order to play Pokemon. Also Nintendo want Switch to sell like device per person instead od device per house, and they cant do that with $300. Also there is point that 3DS will be dead next year so they will need some kind of low price point offer.

We are definitely getting some kind lower price point for Switch next year, only question if it will be thorough revision or current model will get $50 price cut.
Earliest we could get price cut is around E3, but also that depends from potential revision.

OP mentioned 3DS, 3DS is not important, it will be dead next year in any case, Nintendo will look to have lower price offer for Switch, they will not care about 3DS.

Also for people that saying that Switch doesnt need price cut, they are right, it doesn't need, but point of price cut is to more appealing product on market and Nintendo ultimate goal is to sell Switch like device per person insted of device per house, and they cant to that with $300 price.