I kept track of things, because of course I did 
. Individually, part2 of the mission ends at 9000 quicksilver. At 45 quicksilver per scan, that’s a limit of 200 scans. Unfortunately, as you’ve said, that means our community progress meter also vanishes, so we can no longer monitor anything. The meters are weirdly off too. The tooltip shows total progress for all tiers & just the current-tier, but the log screen lists double for the current-tier.
Overall progress looked very discouraging to me. It’s not currently going fast enough to finish tier3, and now that we know there are caps, I’m doubtful enough reliable players will still be left to even finish tier2.