My wife, who works with autistic kids, had an approximately 50% participation rate in online classes among her kids at the end of the last school year and there were significant problems trying to keeping them focused. There were no known issues involving lack of hardware or broadband since the school provided each student a chromebook and our local cable provider donated free broadband access to every student household. We spent a day as volunteers delivering chromebooks to households and I was actually surprised to see how few required them since her school services a very low income base.
Latest word as of this morning is that our district will open the new school year as normal with parents given the option of keeping kids at home for online instruction, then if the need arises, adjusting to a part-time school schedule involving 2 days per week in the classroom and 3 days online. I think it's too fluid at the moment though to take that as gospel.