I haven't found a root cause yet, but after I ran the Switch_intel.sh script and rebooted I couldn't get past the Ubuntu boot splash screen.

I'm sure this was user error on my part, but if anyone else comes across this problem, here's the steps to fix:

1. Hold space bar down during boot to drop to a Grub menu
2. Select a recovery mode kernel for your boot option
3. You will be presented with a list of options in recovery mode. Select "drop to root shell"
4. Execute the Switch_nvidia.sh script
5. Reboot

This got me back to square 1, which for now is going to have to be enough. I'm excited to have a future option of switching to the intel graphics chip for battery saving goodness, but I'm going to wait for this to evolve a bit (and some needed kernel fixes to happen).