I'd love to think we can, but in all honesty, I just don't think we are consistent enough. Our form over the past few months has been terrible by our standards. Last night was great, but until Bernardo's goal we were sleepwalking into another inept second half performance. If we can use last night's second half goals as a catalyst to help make our second halfs better, then maybe. But statistically, trends are usually the best indication of predicting what will happen, and our trend doesn't look great, certainly not title winning levels.
Saying that, the gooners should have killed us off by now, with our form they should have taken advantage, but they haven't really, and football is a funny old game, so never say never I guess.
The best we can do is keep the pressure on them by winning a game at a time, Fulham is crucial IMO. I don't think this Arsenal side yet have the mentality of champions, so the longer and closer we can push them, the more likely they are to start flapping.