He's put in consistently good/great performances over the last few games, since he came back into the first team. Although this is too narrow a time frame to be basing any projections on, I think it's too pessimistic to be saying he'll start to perform terribly any time soon.
IMO the only thing that's changed is that he's been given a solid run of games in which he was lucky enough to pull out a confident performance in his first one. It looks as if we could have the beginnings of a great attacking understanding between Zog and Ireland, or Ireland and Bent, if the other two can find some consistency and we find a set up that accommodates them all. However, nobody seems to remember some of the excellent link up play he pulled off with Downing last season when brought on for 10 minute spells as a sub. If those movements had produced goals, which frankly they should have done, we might have seen this 'revival' a lot sooner. Granted, his first team performances were nothing to write home about, but at that time there were worse offenders who kept their place when Ireland didn't. Whenever this was brought up on here, the response would be 'yes but £60k/week...!' Well, unfortunately that's what Citeh castoffs cost... That's what football has become. Not his fault.
Anyway, some people think he looks like a different player, but I just think he looks like a more confident, better-treated version of the same player. He may well disappear back into his shell at some point, but I reckon it would take something to trigger that - like an inexplicable drop, or a tiff with the manager.