DY: there were a few rabbis who took this position before the KS controversy. (rav herschel schechter, for example). The signators to the kol kire were not among them. one of them specifically took a different view until this device came along. i am curious to see if they will stick to this position when the tummult dies down or will abandon it.
further, many in the velt rejected the device from the outset because it felt wrong. the charges against the KS from the outset were 1) it is zilzul shabbos 2) the heter was meant for bkoim tzoirich gadol 3) the company were made up of bad guys.
it seems like even if a device were to be invented which would address all the meolocho issues, there will be many in the tzibur who will reject it because it violates what they know about shabbos and they will therefore look for a poisk who will give them a tzad to be oisser. rav sz once famously said about another device, it is a kula shein hatzibur yachol lamoid buh. the fact that so many people use an eiruv which was oiker an entire melocho to which massechet shabbos devotes most of its attention and relies on daas yichidus built upon hekeilim built upon daas yichidus shows that when it comes to some things, the letter of law matters less than what we feel comfortable with. at the present time, the tzibur, for whatever reason, feels comfortable with an eiruv but not flicking on lights. i know that i, for one, am one of those people.