The French Marussia driver crashed into a removal struck during the Japanese Grand Prix and is in a critical but stable condition, almost two weeks after the incident.
Blundell, 48, said more needed to be done to protect the drivers after Bianchi crashed into a truck that was out removing the car of Adrian Sutil.
"If you meet with a five-ton tractor with no protection around it that's not what it's designed to be. It's not designed to be there, and you're not designed to be out on track to hit it," he said.
"So, they have to look at that and understand what they need to do to make things safer.
"Lots of discussions about making the car safer with closed in cockpits but I think that's a way off and not ideally the way to go about things.
"We'll have a huge amount of questions and even more answers that will be required, and I'm sure some of those answers will come out in the next few weeks."
Blundell said the 25-year-old Bianchi had a bright future ahead of him, particularly after Ferrari put him in their academy.
"I don't know Jules personally. I've seen him, watched him come up through the lower Formulas and without doubt a great talent and undeniably destined for bigger things," he said.
"And I think Ferrari already had their eye on him and put him in their academy."