Javascript. Not to remove it, but to make it better from the start. Current JS feels painful to me because it feels like piling hacks on top of a poorly-designed language to make it palatable. Doing it better from the start sounds amazing.
escript cscript mscript ascript
Maybe if something like webassembly had come along earlier, we could have avoided all that "javascript as bytecode" nonsense.
[1] https://books.google.com/books?id=3b40AwAAQBAJ&pg=PT32#v=one...