“It is highly unusual to get a general consensus of rabbonim “
When Rabbi Willig completed the Riverdale eruv, he asserted his authority and laid down the law that absolutely nobody was permitted under any circumstances to question those who use it. For anyone who questioned it, it wasn’t necessary to use it themselves but it was absolutely forbidden to characterize those who did use it as non-shomer Shabat.
We need more rabbis like Rabbi Willig.