If you're going all in, you'll probably be okay, but I'm nut sure how broad the audience will be longer term. It feels like the focus is going towards cross-platform (at least iOS + Android) as much as possible. There will always be a need for some custom glue to each respective platform even then though.
iOS isn't going anywhere, but Android is also here to stay, and a huge market share to ignore. Few businesses will fund two separate applications with distinct code bases if they can target both relatively well with a single code base. That's just my $.02