There was a major difference in the child in Texas and this case. The child had a 100% fatal genetic disorder that cannot be cured, treated, or repaired. Most babies with it are stillborn or die within hours/days of being born. When they took the child off the ventilator he died within seconds. Even with the ventilator, the child would have died within a few months to maybe a year or so.
They say that about Terri too. It doesn't matter if the proper legal consent has not been given. Even so, with Terri there are certain ways to 'allow death' that are not legal.