Didn't amazon already spin off or is in the process of spinning off it's Kindle operations/department? Lab126 or something.
It already did.
The issue here is not that the CA bill said "Out of state internet retailers have to collect and remit sales tax"; CA can't do that per USSC decision. The issue is that the USSC decision said states could force online retailers to collect and remit sales tax if they had a "physical presence" in the state. That physical presence has been called "nexus".
The problem is that the term "nexus" was not ever defined. There were several rules-of-thumb applied in "nexus tests" but they all typically required home or regional home offices, warehouses, etc to establish nexus. Companies like Amazon got around the rule-of-thumb tests by divesting their operations to subsidiaries and affiliates, to the point that Amazon.com Inc. is almost just a shell company, and then claiming that none of the subsidiaries and affiliates count for nexus.
CA, and TX and NY before them, basically said "Well, since the USSC didn't define nexus, we'll go ahead and do it". Then they passed bills, like the CA one in question, that say "In California nexus includes all affiliate and subsidiary business relationships." So, even if Amazon spun off Kindle to Lab 126 (which it did) it would still constitute nexus for California purposes.
This isn't a situation where Amazon is trying to but time to weasel out of the CA nexus definition; it was written so that they can't weasel out. Instead, CA said "We will give you 12 months to convince Congress or the USSC to define nexus on the federal level. If you can do that it will trump our definition and we will live with that. If you can't you will be subject to our definition and you will live with it."
Basically. if Amazon can't get Congress or the USSC to define nexus in the next 12 months they will either have to collect and remit CA sales tax or pull out of CA 100% with no subsidiaries or affiliates left.