CoSN (the Consortium for School Networking) recently released their annual report tied to K-12 infrastructure and discusses how the E-rate has impacted these institutions over the last year. The report specifically states that “….Thanks to the E-rate modernization, which provides funding for Wi-Fi and internal school network connections, tremendous progress has been made over the past three years. Districts’ confidence in their wireless networks to support one device (or more) per student is increasing. A large majority (69%) of respondents report they are “very confident” in their network’s ability to support one or more devices per student as compared to the prior year’s 58%...”  
Further details and the full report can be viewed here.