Because both San Francisco and LAUSD have announced they are planning hybrid for next year. LAUSD also has a new testing protocol (which sadly our school pioneered and the County fell in love with) requiring the testing of students (I posted the video up above). Also the mask thing is likely to be required even in the private schools until kid's are vaccinated, and under the CDC school "reopening" plan students are required to maintain distance even in the blue.I'm pretty sure that teachers and support staff (schools) are in the higher priority groups for the vaccine so that schools can be safely (for the adults) opened again. That's the stated position of the Pres./WH at least and is seen (from their statements) as a main priority. So I don't understand why you think this bleeds into the next school year. That strikes me as hyperbolic TBH.
As an aside, my kids are in private $chool$ and have been open for most of the current school year. There have been few outbreaks, but mask wearing and bubbles are mandatory and non-negotiable. If you don't comply, you are done. That's easier to do in a private school obv. Some kids are online due to personal choice (high risk / fear etc.). So I'm in the kids should be in school "camp" fwiw.
Kids will be in school next school. However, if you are in a public school in a large blue city it's not going to look anything like "normal" and some of that is even going to bleed into the private schools in these cities. Even Biden yesterday said he's hoping for a return to normal generally, if we are lucky, at this time NEXT year. And if you have an exposure, your kid is still going to be sent home until they are tested, which means disruptions.