Sure, I would like that improvement too. Numbers made only to show that "fpga is taking over btc" not possible at this moment.
Not necessarily. This one won't take over bitcoin mining, that's for sure. But that's quite different from other people may already have (most likely do) and what this might evolve into.
Not if your fpga small scale rig need to compete with AMD costs, who manufactures millions of GPU's a year.