I AM very confident with the $1900 one :

1. More than 3 months after monero change algo (just a little different than cryptonight), X3 might update its firmware just like Baikal's miner.
2. For Monero only, with total 4 batch of X3s and if each has 10000 units for total 40000 units means hashrate will rose by 8.8 ghs. With current around 1 ghs and X3s 8.8 ghs for total around 10 ghs, it still mining $20 a day or $600 a month (220khs of cryptonight in Nicehash $200 per day now). Usually Bitmain's Batch only 5-6k or, it will more profitable.
3. Even if it can not mine Monero, there are many coin that can be mine AND there are auto switch pool or rent service like Nicehash so its still profitable.
4. Competitor doesnt have anything big to compete, so network hashrate wont be that big. I would love to add Halong but their miner not be seen anywhere.
5. I always touch break even point at whatever Bitmain throw, even D3 that hated by everybody. All calculated by coin not USD

The point of mining is INVESTMENT for a long time. If you mine with S9 right now and sells the coin right away at 8-9k, then you miss the point and of course you will have big loss. Hold the coins and set sell order at your favorite exchanges with 5 times of its price right now OR atleast wait for next halving.

Im not siding with Bitmain BUT they almost counter every competitors with better hardware. I bet when new SHA256 miner with 2x efficiency, Bitmain will release 4-5 times better OR cheaper.