First, I sympathize with the Twitter engineers who have had to build a scaling system improvisationally under incredible growth and time constraints. I doubt they have time to reevaluate early limiting decisions except when things are on fire, and even then they probably only have enough time to go for the quick fix.
Ultimately, though, I'm sure they'll figure out a way for this to work -- especially as it only requires "3%" of users to get @unacquiantanted-replies the same way they get broadcast messages.
One approach: split accounts into two inner accounts, for example, aplusk and aplusk(all). Only the original name is ever publicly shown -- though the account's public page shows the all tweets, as now. However, which one people actually 'follow' depends on their 'show all @unacquianted replies' setting. Thus every aplusk(all) tweet is handled as a broadcast, because all those followers -- only 3% of the total -- prefer it that way.
Ultimately, though, I'm sure they'll figure out a way for this to work -- especially as it only requires "3%" of users to get @unacquiantanted-replies the same way they get broadcast messages.
One approach: split accounts into two inner accounts, for example, aplusk and aplusk(all). Only the original name is ever publicly shown -- though the account's public page shows the all tweets, as now. However, which one people actually 'follow' depends on their 'show all @unacquianted replies' setting. Thus every aplusk(all) tweet is handled as a broadcast, because all those followers -- only 3% of the total -- prefer it that way.