Apple fixes this stuff quickly enough for it to not be a huge issue, and if they ever needed to make iMessage a separate app like Android does with theirs they

Apple fixes this stuff quickly enough for it to not be a huge issue, and if they ever needed to make iMessage a separate app like Android does with theirs they could do it. I'm certain they could remotely make it show up in the App Store in a moment's notice if needed. App store has root access, it can do it.