Impractical and unnecessary.
With the Switch Nintendo have already found their perfect place in the market with practically no direct competition. There's no sound reason for them to push for more than what they're already doing, so I'd only expect their next system to be a simple generational upgrade on the current Switch until there's reason to expect otherwise.
When NX was still in the planning stages, people went wild with theories and ballooning expections of what Nintendo could possibly push for with technology, and the result turned out to be modest and simple. Instead of going wild with over-active imaginations again, it's better to just keep modest expections leaving the possibility to be surprised if Nintendo actually do something crazy.
