If you maintain it according to the maintenance manual......
Nobody knows. Because only time will tell. The I1 is not yet long enough on the market to know. Any part can be swapped with a new one. As long as DJI or third parties, supply the parts, it will keep operational.
Parts have to be changed after a number of flying hours/flights, depending on the part. If you keep doing that, it will serve you for as long as the parts are available.