Yes, I remember the film very well. It was terribly distressing, so much so that my husband said he couldn't watch it any more - though I watched to the end.
Lorenzo lived to the age of 30. I suppose we will never know if there was any quality to his life, but it doesn't sound great. The New York Times reported, on the death of Lorenzo's father in 2013:
"From about the age of 8, Lorenzo was paralyzed and blind, unable to speak, dependent on a feeding tube and kept alive by round-the-clock nursing care and the nearly full-time ministrations of his parents. They talked to him constantly and insisted that visitors do likewise, though no one could be certain about his level of awareness. His parents believed that Lorenzo recognized their voices, loved music and enjoyed being alive.
"Mr. Odone conceded, mainly in interviews he gave after his wife died in 2000, that he had sometimes wondered if that was enough of a life to justify the extraordinary lengths to which he and his wife had gone."