Flying into OIA before Magical Express was something to plan for and deal with. If OIA cannot come up with a plan 12 months from now, it will go back to the old ways. Guaranteed that the new system will not be free.I know. I was just referencing the part of your post that said "the rental counters are nearby." Hertz is even better - you just go to where the cars are parked (with the keys in the ignition) pick out the one you want and check out on the way out of the lot.
My point was that without the Magical Express handling large numbers of guests, there will be a lot more congestion at the airport - more people waiting for luggage, renting cars, getting into Ubers, etc. It won't be as uncrowded and easy as it is now, with the buses handling so much of the transportation. Hopefully, a new system will come into place before this happens.