RE: DragonMint T1 Miner With AsciBoost is Awesome, But Here’s The Problem
As you wrote, it is not clear if DraginMint is real or scam but also with the slightly higher hashrate these will not do the job anymore.
Many mining farms are located in regions with power cost as low as 1 cent or little more; this still gives a pretty bad ROI based on your calculations.
There are no rumors yet if Bitmain is working on the next generation of Antminers. This development could improve profitability by a boost of Hashing/power consumption ratio.
The central question remains: what happens to bitcoin mining once it is no longer attractive to mining businesses. We have seen a massive increase in transaction cost, it might be that very soon, transaction fees are the only income stream for miners, and thus transaction cost will skyrocket once more. Ultimately this might kill Bitcoin as BCH, and other Altcoins are going to be even more attractive to the big players in the mining business.
It will be interesting to see how this develops. However 'in theory' the whole mining profitability issue should always find a state of equilibrium. If it becomes unprofitable to everyone then the hashrate will drop, the difficulty will drop and thus profitability goes up. Bitcoin value can also increase to increase profitability, but of course manufacturers set pricing of hardware accordingly, so margins will always be tight to end users. I don't really see it will increase the adoption of alternative currencies such as Bitcoin Cash, the automatic balance of profitability applies to all POW cryptos.