However, the ruling did not strike down California Statute 32390, which declares all magazines greater than ten rounds to be a public nusience and are to be confiscated by authorities whenever encountered.
So you can buy and possess them, but you may be replacing them often.
While you are technically right, the case will very likely be denied writ of certiorari. This is the path of bad 9th circus 2A decisions for decades now. It's a great decision, but it will certainly be reversed by the 9th Circuit, then SCOTUS will very likely deny writ, and the law will stand. I doubt we will see SCOTUS take any important 2A cases that address things like concealed carry, magazine capacity, or assault weapons bans until there is at least one more pro-2A Justice. For that to happen, we really need to keep the WH and Senate in 2020.