Ward was on the bench for the last part of the season. He's been through the coaching process - it's supposed to work, after all - he's been added to the first team squad, he's young, he's ambitious, so why not keep him as number two? What is the point of all these keepers coming through the system if they're never, ever, promoted to that position?
The argument against seems to be that the first choice keeper needs a top experienced keeper to 'challenge' him. But that hardly ever works anywhere, firstly because a keeper worthy of being first choice is highly unlikely to put up with being kept on the bench, and, secondly, because this 'challenging' doesn't, in reality, happen.
How is the second choice keeper going to put pressure on the first choice one simply by training with him and watching him from the bench whilst his own form rapidly becomes but a distant memory? Clubs never think this through.
If someone was to suggest buying a first class centre back, or central midfielder or striker, to 'put pressure' on a first choice player, and then keeping him on the bench, maybe not playing one minute of football for several seasons, or maybe just one or two run outs in the League Cup, people would quite rightly say it's a stupid idea. But for some crazy reason it's accepted largely without question because it's a goalkeeper.
There are only three reasons why a really good keeper is on the bench: a) like, Cech, he's been ousted, and is therefore only there until he can escape to a club that values him more; b) he is good but lacks ambition and is therefore not putting pressure on anyone; or c) he's not really that good any more because he's old and on the way out. So just show some sense and use the young keeper you'e supposed to be grooming for the job anyway!!