One thing to say mining bitcoin consumes a large amount of electricity and it would take lots of equipment to manned the mining. There should be a development in making the cost of bitcoin lower; given that lower mining cost could yield a higher profit. However, it matters on trading and exchanges.
that wouldn't make any difference as it always depends on the amount of miners and their hashing powers. If the costs were lower, than more people would have mined and the result would be the same