[Notice the almost explicit slap at Zomet.]
[ UPDATE: The fallout from this declaration has been swift and furious. Both of the insitutes that deal with the interface between Halakhah and Technology stood by their guns and defended the use of Shabbat elevators. I suspect that the observant public will vote with its feet (literally) and keep using the elevators. In the end, all that will be achieved is a further diminution in rabbinic dignity (and, I fear, the dignity of Jewish Law, as well).
There's another aspect of this issue that relates to my ongoing discussion of Modern Orthodoxy in Israel. I understand from a well placed source that a group of very serious Haredi rabbis consulted with an expert on elevators and their halakhic implications. After hours of careful discussion of the intricacies, and why the permitted versions are fine, they left this religious scientist with the clear impression that: זיי האב'ן גאר ניט פארשטאנ'ן (ie 'They didn't understand anything'). The prohibition against using elevators was published not long afterwards.
This is yet further proof that there is something profoundly deficient in a Torah world where the halakhic authorities lack basic literacy in the sciences (including social sciences). You might not need to have a degree (as proven by R. Moshe Feinstein זצ"ל and R. Shlomo Zalman Auerbach זצ"ל, who were able to engage scientists and other experts). A degree usually does help. After all, Rav Soloveitchik זצ"ל did study Physics with Max Planck, the pioneer of Quantum Mechanics, and that enabled him to address issues far out of the usual purview of the contemporary halakhist.
However, it is such illiteracy that Haredi and Hardali rabbis advocate. They fight to keep the three R's out of the schools. One brags on the radio that he lacks a High school education. And so on and so forth. Judaism will only be the loser from this state of affairs. Yes, there is room for principled difference of opinion. First, however, you need to know what you're talking about.]