Your thread title is incorrect and doesn't match your survey.
"English only" and "English as official language" are two different things.
I would fully support English being designated the Official Language of the USA.
I would further this though by REQUIRING that ALL kids manditorily learn at least two others, starting from kindergaten.
For example, Singapore (unlike America) has English officially designated as their official language. However, you cannot advance to the next grade in school if you are not passing your Mandarin, and "other" language classes. Everyone speaks at least two, if not three languages. Take a look at this and you will understand WHY they are the business hub of all of Asia.
In the USA English should be the National language, with kids being required to learn at least one or two others. I would promote Mandarin and Farsi.