Does the experience drain the visitor's devices of energy? Will the batteries last?
Is too much technology involved in the experience? Can it be done with less tech?
Are there established patterns/trajectories of visitor movement? Can these be changed?
Does the experience rely on funding? How long will that funding last?
Does your staff have the expertise for day-to-day maintenance of the technology? Is there someone on hand to tackle small problems?
Will the technology be around in a year's time? How about 5 years? How long can you expect external support?
Is wifi and/or phone signal necessary for the experience? Is it available and dependable?