JAVASCRIPT IS GREAT:
Runs in all browsers
Familiar syntax
Dynamic typing
OTHER LANGUAGES ARE GREAT TOO:
Existing code
Developer tools
Static typing
MIXING LANGUAGES:
When useful, gives you the best parts of multiple languages
GOING THROUGH JAVASCRIPT:
Might seem like an odd solution
But replacing JavaScript with anything else would slow down the web
Adding another virtual machine (VM) alongside JavaScript is complicated (cross-VM GC, etc.)
Consensus to standardize any such change would be very hard