Not really. There's a huge portion of the audience who will just _not_ want to do melee basics all day long, every day.
Possibly. I just think it's too hard to tell without seeing all the bells and whistles available to enhance those melee basics.
What do you mean? I can tell you right now, there will be tons of players that like this guy, and tons that won't ever touch him. None of the specific details are going to remotely change that - unless they get a level 3 stance that says, "Any enemy you hit dies instantly". But we just aren't going to see anything like that - I'm sure the power level will remain on par with everything else.
It is just a different style of approach - an interesting one, that will appeal to some, but certainly not everyone. Not a chance this will supplant the PHB fighter.
Be careful when saying "not a chance" before seeing everything.
Versatility has value. Lets say that the knight has completely equal raw power to the regular fighter. They are even on the power scale.
These two guys both go Wheel of Fortune and both manage to win 10,000 in prizes. They have won an equal amount of stuff but because each of them signed different agreements the regular fighter must spend his cash in the encounter and daily prize lounge. The knight gets to take his cash and put it on a gift certificate good for 10,000 worth of general ass kicking to be spent as desired.
I would give that at least a chance. YMMV.