The Wii went through many different changes but was still The Wii, with almost nothing different on the outside. This is how Nintendo has operated in the "next generation" here. It's extremely likely they're not going to release a "switch lite" or a "switch plus" or whatever for a while, because that's a whole mess of logistics to deal with and the problem exists only in the Tegra chip.
When the drive chip was compromised in the Wii, it went through at least 5 revisions, from clipped pins to how instructions were run, necessitating changes to how people compromised it, and there is no evidence pointing to a new revision sold as a separate device.
They're likely to just get a Tegra chip that isn't compromised by massive security flaws that only a hardware revision can fix, and work it into the assembly line in lieu of the old one.
