I don't think you can pin point the Switch's lifespan. One of the problems coming down is massive inflation. The Federal Reserve is slowly admitting inflation is not as transitory as they hoped. This is going to throw everything for a loop. In a few years, you wont be able to release a new console as budgets get tightened and savings wiped out. Nintendo has a good thing going with the Switch right now and there isn't much reason to make another one. Moreover, there is a large library of titles on the system so they can coast on that. The other issue is development cost will go up, so any project that extends multiple years will have to factor in inflation and rising wages (cost of living adjustments). The Switch is in a good spot where Nintendo doesn't have to make 5 year projects.
I think the Switch will easily be around until 2027 (if not inflation, deflation will likely hurt more, but that's assuming the Fed Raises rates). Nintendo was probably already planning for a longer life cycle. COVID pushed it out a year or two, and this will likely push it out much further.
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