Yes, cranes will always exist. The difference is how much longer the cranes hang around these days. How much longer FLE took vs how long it took to actually build the Magic Kingdom back then.
But...Wow thanks for that photo! It was so pretty, everything matched so well back then. I took a picture last month and was disappointed at the appearance of the entrance , it was paved by the City of Chicago, one patch job after the next, nothing matched.
I was there the year it opened, I was so young didn't appreciate the Magic Kingdom when it was pristine.