There's no clamour for him to be given the slot, only a request that we get behind him when he is called upon to serve the team
Mullen has an injury history that makes me think he MAY have arrived short of fitness & sharpness and in that situation Peter is maybe being given the responsibility of stepping up and also the chance of enough first team minutes against lower league opposition to improve & learn. It was already said (somewhere) that Peter would get the group stages to stake a claim, if he fails then I'm pretty sure that he COULD be either sent on loan or let go, but that would leave us with only one keeper, a player who has recently struggled to last a full season.
So, I don't get all this "clamour" to hive 2mP off just now, we can't afford to field an academy player or an outfielder in goals in the premiership so let's just see what the management team can do with the situation. And stop giving the guy a hard time.