Forever?
If they remove them, they can't repair bricked TI-Nspire.
I'm betting they'll try to use different ways to do it, even if it requires modding the hardware. Even if it would be more expensive and harder, I bet that this is what they would do, seeing everything they did so far. I bet they would be even ready to lose money from repairing bricked Nspires if it meant permanently getting rid of ASM development. Plus OS updates will most likely occur via wi-fi or something