"Who will sponsor and invest in quest making?
all would be for zero if the important question of who will sponsor and invest is not answered."
Who would make art if it no longer was profitable? Artists
Who would write songs? Musicians
Who would create novels? Authors/storytellers
Who would create Zelda games without financial compensation? Fans
If someone thinks that the only thing that will motivate them to finish what they started is a bunch of people financially supporting them for ease, that person is highly delusional.
Separate from above comments:
Similar to OP:
"Hypothetically," if Nintendo themselves said "We have plans to make another Legend of Zelda, even greater than BOTW, but we need you to pay for it first, so we can work on it. We are so busy making all of these other games and systems, we just don't have the funding for Zelda, so we need your help to get it going and keep it going. We believe with enough funding, that we could get this game out in a reasonable time for all to enjoy. Any financial contributor would get the first release before it hits stores." (After all, Nintendo is THE "flagship" quest-maker for Zelda.) Would you support it financially? What kind of timeframe would you expect your results in? What kind of timeframe do you think others would expect (reasonable and not)? What kind of backlash do you think they would suffer when they don't deliver on time and/or a worthy product?