we have had mobile wallet and trading app for quite a while and I don't see mainstream bitcoin usage... something's missing.
Awareness.
Of the people I've talked with across a broad spectrum of industries and disciplines, from a wide age range among management and executives to engineers and investors, there is perhaps low single-digit recognition of Bitcoin. That's including the majority being "I've heard of it" responses. Only a handful, usually younger individuals, actually have had even a rudimentary understanding of how Bitcoin works and what its potential is. Almost all of those consider Bitcoin interesting, but remain guarded, preferring to wait for version 2 or 3, or a 'stable' release.
Until people know the Bitcoin logo as well as even an obscure household brand-name, growth will be an uphill battle. Anonymity and irreversible transactions are just not big selling points for most people. Catch-phrases that speak to what matters to them would go far in getting the initial interest, something like: "Bitcoin: Better Money"; "Bitcoin Doesn't Do Bailouts"; "Bitcoin: Checking & Savings All In One"; "Keep Your Rewards, Pay Lower Fees With Bitcoin".