Do you think that English should be declared as the "primary" language in the U.S.?

I've been seeing a lot of bumper stickers in my town that say "welcome to America, now speak our language" and similar statements. I find it ironic that these people do not know that English was never declared as the primary language in the U.S. The founding fathers did not was to declare a primary language because there was such a diversity of languages spoken among them (Gaelic, French, German, Spanish, English, Etc.). So my question is now that the primary language used in the U.S. is English should we declare English our primary language or should we leave the law the way it is and never declare a primary language since English is slowly losing it's popularity and Spanish is becoming the predominate language spoken?