Yes, that is exactly what I think will happen. They'll start bundling games with the Switch (perhaps BotW and/or Splatoon 2) starting 2018 at $299. Then an official price cut to $249 late 2018 or early 2019, before releasing a Switch Lite in 2019 at $179-199 that will fully replace 3DS as a handheld device.
Actually, the smart call would be to eventually move everyone over to the Switch and instead of releasing a Switch Lite, drop a new Switch (using a newer version of the Tegra chip).
This would essentially put Nintendo on a path similar to what Sony and MS are on, but with ARM based Tegra chips instead of x86 processors.
Think of it as something like the Xbox One X. A more powerful version of the Switch, but is still able to play the same games.
Switch 2.0 could slide into the $299 price point and the OG Switch would drop to the $179-$199 price point.