As merchants not supporting Apple Pay see a loss of sales they will adapt to Apple Pay.
People shop where the conditions are right meaning Price, Selection, Courtesy , Check Out experience and Payment method excepted.
While it's a bigger battery most likely it will provide little if any additional battery life The IPhone 6 is expected to have health monitoring functions that will constantly be on and use more battery power
In any case the Iphone6 will be great
LM is A long ways from being a part of your cellphone. While it has many advantages As an alloy, it's not cost effective at this stage of the game nor has it been tamed to create what Apple or crucible wants. It's out there but will it ever become reality remains to be seen