And the problem is, serial communication definitely has valid uses for classrooms, so by crippling their Lua (intentionally or not) and by fighting native code, they're doubly hurting themselves...
Why do I keep thinking that the only effective way to deal with TI is to hurt them financially such as a boycott on buying new nspires (used is ok because ti doesn't get that money) and pressure on teachers to put the toys away and go back to teaching/learning math again?
I would rather think that enticing Casio to produce superior products and not doing anything to make them want to lock down their calcs would be a more viable option. Just let TI hurt themselves, really. But that will only happen if there is reason to switch to Casio. Right now the development community is still focused on TI because there are more programs for it, thus more users, thus more programs are developed by said users. It's a cycle that feeds into itself. If, however, Casio developers started cropping up more and released high quality software (which they already do), that coupled with, perhaps, a more powerful calc from Casio could start siphoning off TI's userbase and start its own cycle of growth.
Besides, who says we need to fight TI. We can't really beat them anyways, we're only a minor portion of their profit margins, sadly enough. The best we can do is help Casio grow to surpass TI and not make them dislike us in doing so.