Does longterm storage in a connected state harm the studs/tubes?
After researching the question further via some local AFOL, the answer appears to be "No". The tube/stud system remains robust if stored in a connected state. Connectivity issues arise after the studs/tubes begin to wear down due to excessive usage or the elements become cracked. Simply storing a model intact does not lessen the life of the bricks. However, storing LEGO elements out of direct sunlight is recommended.