A portion of every Memorial talk seems designed to discourage anyone from "partaking" ( Do anyone but Witnesses even use that word?) The speaker practically DARES anyone to do so by making statements such as "Likely very few, or possibly no one here will partake of the emblems.." If that's really their view then why pass them around at all. They could just as well ,after praying over them make an announcement "At this time, those annointed for heavenly life may come forward and partake of the bread and wine. If you are unable to do so, raise your hand and an attendant will bring them to you.."
My own view is that everyone present does partake of Jesus body and blood, in that , all are there (at least to some degree) to His request to do this in remembrance of Him..and the emblems are offered and passed to everyone, so all recieve them in that manner.
Scripturally we are supposed to be "discerning the body"... reflecting upon and thankfully appreciating Christ's sacrifice. I do not think actual physical consumption of the emblems is required, or in some cases even possible.