Switch-Lite will launch in 2020. It will be slightly smaller, with better battery life, and cheaper to produce. The price will be $200 without a game, or $250 with a pack-in title. 

Improved Switch probably around 2021. Switch Mini/Pocket probably next year.

Let's just wait for the next generation, shall we?

While I agree with the sentiments of many, that the system should ride it out as is till its time for a new system, there are also the slight modifications that have been made to their other portable systems over the years.  If they are going for an upgrade in battery life or a slight design change, then I see it happening in 2019 and then that model will ride out till eol.

My guess would be 2021 at the earliest.

See no reason this console would not be a full console generation.

I think there wont be a smaller version cause Joy-Con consistency, nor will there be a stronger version cause porting consistency/splitting userbase. The revision will just have better battery life, better wifi, more storage, and a bigger screen size so no bezels.

Hi.

What are you asking?

Probably a year after the PS5 releases. I always thought they would treat it like the DS and 3DS, but now I dont think they will.

Nintendo knows that the 3DS will fade as Nintendo Switch grows, and they need to fill that lower price entry point to expand the platform significantly.

People hoping for some powered up SKU that has a bunch of games the original Nintendo Switch cannot run have not paid attention to Nintendo’s history with said revisions. Anytime Nintendo has made such SKUs (i.e. DSi and New 3DS) they have allowed developers to make games for them that do not run on the original models, and the amount of total software that actually forgoes the existing user base has been very very very few titles. It just does not make sense for the financial side of things for developers to cater a portion of the install base rather than the whole install base.

Will Nintendo make Nintendo Switch models with newer and better SOCs? Probably so, but the performance benefit will be marginal to non existent at best, as the focus will be to reduce cost of the total cost of materials (i.e. a 7nm SOC would allow them to put a smaller battery, reduce the entire chassis size, and remove the active cooling).

Nintendo is not focused on upgrading resolution of their consoles. They are still selling a 240p handheld console in 2018 at reduced costs with a very healthy profit margin on hardware and will continue that focus in the future.

In 2023, the Nintendo Switch will still have a 720p screen and Nintendo will be happy with the low cost and high profit margin and will have multiple SKUs.

Nintendo's focus is it leverage its software library to sell its hardware, and to reduce costs of hardware while addressing a wider audience. Focusing on CPU and GPU power and splitting their user base is not where they will expand and Nintendo knows this.