Borsuk, who has monitored the city's school enrollment trends since around 2008, said the milestone was a long time coming. "Every year the MPS share of the pie, where city of Milwaukee kids are going to school, has been going down a notch," he said. "So you could see the 50% level coming for a long time."

The shift reflects a combination of forces. A declining birth rate has shrunk the overall number of school-age children in the city, and the state's private school voucher program now serves more than 30,000 Milwaukee students, according to the Wisconsin Department of Public Instruction. MPS enrollment has fallen every year since the voucher program began in the 1990s and is down more than 10,000 students from a decade ago.

"There are 50,000 plus kids in the city of Milwaukee who are not going to MPS schools, and there's 50,000 reasons why they're not doing that," Borsuk said. "The underlying message is pretty clear. We're not going to MPS."

Asked what the figure says about public perception of the district, Borsuk was careful not to disparage MPS but acknowledged the obvious. "I'm not here to dump on MPS. But you can't avoid saying an awful lot of people, 50,000 kids and their parents, are making choices not to go to MPS," he said.

He rejected the idea that the trend spells doom for public education. "This isn't the voice of doom. It is a message of, wow, we need to do more about this. We need to maintain the vitality of the system," he said. "Enrollment is vitality. Enrollment is, frankly, money. Enrollment is creating a chemistry for a school or a culture for a school that attracts more people."

The enrollment milestone arrives as Milwaukee grapples with a reading crisis that cuts across all school sectors. Borsuk said roughly four out of five city children are not reading at grade level from third grade through high school. "It's worse in MPS, it's not so great in the voucher and in the charter schools either," he said.

MPS has reported some recent gains. In October, the district announced that English Language Arts proficiency for students in grades 3-8 rose from 23.6% to 25.1%, and math proficiency for high schoolers edged up from 12% to 13%. But ELA proficiency for high schoolers declined from 21.4% to 20.2%, the district said, underscoring the work that remains.

Borsuk credited improvements made since Superintendent Dr. Brenda Cassellius took the helm in 2025, but said the district has been slow to confront its enrollment realities. "Have they done enough to recognize the realities for the last bunch of years? No. It's starting now, but it's a very big battleship. And turning it is going to be very slow," he said. He added that Cassellius is now focused on making the system more attractive as the district considers closing schools.

Parents, Borsuk said, are often indifferent to which sector a school belongs to. "No parent wants their kids to do poorly, but parents know what they're looking for and sometimes they're totally indifferent to what sector it's in," he said. "They want a school where they think good things are going to happen for their kid, and many are choosing schools not in their neighborhood and not in MPS."

Borsuk called the 50% threshold a landmark moment that should reshape the conversation about improving education in Milwaukee. "The question is, what do we do with what we have? How do we make it better for everybody?" he said. "We're at a point where if you want to help the kids in the city, I would suggest we need to find ways to help everybody."