It's curious that code requires that the service must be upgraded to 200A. Surely as long as the service fuse is appropriately rated, there ought to be no requirement to increase the current availability unless requested by the consumer. Even if the meter socket needs to be updated to support a presumably more modern standardised 200A meter, that wouldn't be an issue for a lower rated service. From what I've seen in various threads over the years, you still have lots of buildings in the US with grandfathered wiring nearing 100 years. It just seems an odd requirement, as it suddenly forces an upgrade of the lower current distribution panel that was presumably still giving resonable service.
Over here, when the network operator replaces a meter, they just screw the existing tails into the new meter and scrupulously avoid touching or even looking at any of the consumer's electrics, just checking the incomming wiring for obvious signs of meter bypassing or tampering. The consumer needs to specifically ask for the service fuse to be increased in rating. Only at that point will they check the gauge of the meter tails and main switch rating of the consumer unit (distribution panel). People have service fues with 60, 80 or 100A, almost at random (aside from large houses or upgrades for EV chargers etc).