Gym surfaces are way more forgiving then asphalt/outdoors and because the construction of these shoes makes it impossible to crease that part of the shoe should look pristine indefinitely. The sole however won't.
So wearing solely (no pun intended) to the gym shouldn't do much to any shoe...
I'm tempted to double up on the red's. Already have a pair but after about 10 wears (it's hard to not make an excuse to wear other shoes) I don't think they will tolerate that type of constant wear. My 07' infareds still look brand new after at least 300 wears.
Flyknit's are not about that life.
Was about to impulse buy from Exit 36 but I'll just wait until 6/1 and buy both the blue and tarp green's together... Lunargrand's and Flyknit Chukkas type of summer.
You can pre-order the black/orange Flyknits from this german site if you're wear a 8, 11.5, 12.5 or a 13...
http://www.hhv.de/shop/en/item/nike-lunar-flyknit-chukka-mid-fog-white-ttl-orange-white-299756