These elements of the "levy swap" may be why the school district doesn't want it to occur:

" - The elimination of the state salary grid for teachers. The new minimum salary for teachers would be raised to $45,000 and teachers could compete for performance bonuses of $25,000 to $50,000. Teachers in high-cost districts would also be eligible for a housing allowance of up to $10,000.
 - The elimination of levy equalization dollars.
 - Repeal of I-1351, a class-size reduction measure passed by voters in 2014.
 - Prohibits teacher strikes.
 - Beginning in 2020, school districts to go to voters requesting “excess” levy dollars for non-basic education spending items, subject to a uniform 10 percent levy lid."

That's from article titled: "GOP School Funding Plan Would Nearly Double State Property Tax, Lower Local Levies" which was published in January of 2017.