I mean, it took me a while to even implement using shields in my gameplay at all. When I play most games, I ignore shielding all together (Dishonored for example). But when I started to play SSB more heavily I realized it's almost necessary to use it all the time. Don't get hit.
To answer the question though, I would definitely play if shielding and dodging didn't exist. People would find different ways around it, making it a much more challenging way to play. If anything, I think this brings up a cool game type where each person changes their shielding options (L/R) to something else. That way, each player would need to find other ways of defensive play without camping and not attacking.