The only one who is hurting this over a long time is Nintendo.
A. The ad revenue will not be high for Nintendo since the people with a lot of views just stream something else.
B. Less coverage means less PR. And Nintendo is not in a spot who actually can allow less and less PR. They desperately need PR and exposure. And people with 100 views will not cover this. People do not watch these LP because of the game but because of the people who do these LP.
C. These people who actually make money out of it will not care long because there are tons of developers and puplishers including EA, Square Enix, Capcom and Co who love free PR. So yeah all that is hurting is Nintendo no one else.
Also you have no idea how much work the really good LP guys invest in their work. They are not one the top for nothing. Stop making this look like an easy job because it is not. It is stressful, long and exausting.