I really don't think so; those demanding a Pro are vocal internet minority. The average consumer is fine with Switch's current power level.
What would be the point anyway? A Switch Pro released in 2020 would still be weaker than PS4 and still a generation behind PS5/Scarlett.
A “pro” would help interest in the console, the same way the PS4 pro and Xbox 1 X did for their systems. It is a good idea that Nintendo should do for the switch