This is a terrible choice on Universal's part. I went to ride it one last time recently after hearing the news. It is easily the best ride in the park. Parks should be both modern and classic for a wide appeal. People can go to Disney and ride Haunted Mansion which they have enjoyed for 5 decades as well as new attractions. People have great memories of these rides.
Modifying a ride is like the George Lucas Special Editions. You are changing something that already was amazing. Jurassic Park will lose a lot of its appeal, ambience, and storytelling with this change. It will be a shadow of its former self. The ride from the ground up was designed for the attraction it holds. These modernization attempts to make it something it isn't is heartbreaking for a Universal fan like myself.
The T-Rex 'saves you' as the finale? It's the antagonist and dramatic finale of the ride, now it is a hero? What a cheap-out. You can do maitenance and improvements to ride (Peter Pan, Matterhorn, Alice) without changing the whole concept.