"Can I register a plea for evangelicals to stop using 'biblical' as an adjective so often? It makes our writing less clear and forceful, not more."
Yes, but is it unbiblical?

I'm not sure what you mean by 'the big thing' about TEC being their eschatology. Do you mean that is the big difference between us (which is surely hamartiology, epistemology, grounds of authority), or that eschatology is the focus of TEC theology, or...?
In any case, I agree with you that we could do a much better job of capturing people with an eschatological vision, and inspiring them to love the kingdom of God and so live as people of heaven, casting out fear and prejudice.
But I'm not sure that making it 'realisable' (why is that 'most importantly'?) is actually our goal. Of course a realisable eschatological vision is attractive, because it makes us feel powerful - like we can 'do' something. But the eschatological vision of the kingdom is always bigger than us - bigger than all of us together. Is it incumbent upon us to realise the eschatological vision of the kingdom, or simply to reflect it and be awakened by it? I rather hoped God might take care of the broader accomplishment, because there are parts of the vision I don't think are particularly achievable for us (new heavens, anyone?)
My concern is that the TEC eschatology is far from exciting, because it reduces the kingdom of God to the church in this world and has little hope beyond that. The present church is no longer a poor reflection of the glory to come at the return of Christ and recreation of all things, it is as glorious as it gets. In other words, I think TEC have an exciting present eschatology because they didn't need to keep any eschatological language for a surpassing future. But if this earthly communion is enjoying the 'fullness of the kingdom', as you put it, I reckon that's a bit depressing, really!
But nonetheless, I agree with you that evangelicals need to get our house in order regarding the gospel. For too long we have been a "big FRIDAY little sunday" group (i.e. lots of cross and little resurrection), and our preaching of the parousia has been whittled away a lot too. I suspect the problem with our eschatology begins with too little thinking about the resurrection - but thankfully that is getting better and better addressed, I've noticed (substantially due to NT Wright bringing it to our attention).
Blessings
Matt