For
It threatens other languages and cultures.
Against
A common language makes communication easier.
Anonymous excerpts, translated where noted.
“People can't see how this threatens daily interactions, making foreign languages into some inferior secret language in their own country's backyard.”
“you'll only be able to scratch the surface with just english”
“I think it's good that a "universal" language that people all across the world use to communicate exists.”
“Language barriers are a major reason for disconnect in understanding people from different cultures and having a global language will help with communication across countries”