I genuinely do wonder whether or not this will change anything for (current) Apple customers.
As the iPhone/iPad are non-LTE, CDMA-only devices; I don't foresee this ruling impacting the current restrictions that bar the entry-level 2GB data plans from having tethering support.
For the most part, you're right. There is one exception: The Verizon 3rd-gen iPads have LTE. The cheapest prepaid plan is $20/month for 1GB of data, and it comes with tethering.
As the iPhone/iPad are non-LTE, CDMA-only devices; I don't foresee this ruling impacting the current restrictions that bar the entry-level 2GB data plans from having tethering support.