If we can just install this on our current laptops, would there be any reason to still want to run out and buy a Chromebook?
That really depends on how important the following things are to you:
- extremely short boot time
- near instant wake-from-sleep time
- no OS maintenance
- no malware maintenance
- no deterioration in operating speed over time
- no local backups to protect data
- no apps installation & config when changing PC's
That list and more is discussed here
Clearly, you can run the Chrome browser and web apps. That give you some of the benefits. However, running Chrome on a "traditional" OS still requires that the PC and OS be protected in all the recommended ways.