We already have... or at least "They" already have. But there is, understandably, no intent or desire to communicate. I will never forget how a Belgian Airforce colonel in the eighties, who was absolutely not a ufo believer, risked his reputation, together with several other officials, admitted they saw what could only be described as extraterrestial objects: https://www.youtube.com/watch?v=8M-ls_qP98M