Ad supported free OTOH infinite running cool but a little crappy games are great for selling more conversions to better paid apps (CandyCrush). They're also more profitable on Android since users expect mode of "something for nothing" as opposed to the Apple tax. Often with games and other non-one-time-useful and non-business-critical apps, in-app purchase of ad removal, virtual currency buy/offers is the way to go rather than paid. But it depends on the quality expectations of the app too.
Generally, If someone believes they can't, even if they may have the aptitude, they'll never know. That is the greatest regret and waste of talent imaginable. One also has to be clear and honest about one's/others' capabilities/needs in order to not get stuck in wandering in wantrepreneur land.
Finally, startup people are most similar to special forces badasses... able to get sh*t done, figure it out and eventually win.
I am not saying your proposal isn't a good strategy. There just isn't a guarantee for success. Even your app claim sounds less convincing if you look at the actual average revenue for apps.