Pretty much, unless Nintendo went out and fully funded a bunch of AAA million dollar third party projects, it was either build up an install base with a lot of 1st party content or have system which lacked both 3rd party and 1st party.
Nintendo's best chance at getting 3rd party support is with a large install base, and their best chance at getting that is with really popular 1st party games like Mario, Zelda and Pokémon.







