I'm not sure why you believe that. There's an incredible amount of work that remains and innovation happens over decades. There's certainly a lot of room for improvement.
We are entering that age because tech is addressing issues like this and has made life easier for the paraplegic man.
I'm not sure it's made life easier for him yet. He walked 3.5 metres, but how frustrating would it be to lose the use of your legs and then be tantalized by something sort-of-like walking again, but within very controlled situations? But the promise of what's to come is fantastic - my dad's a lifelong paraplegic due to polio and although this tech is too late for him, it's wonderful to think others may have a chance.