Sincerely I'm having the same doubts as you too, the consistency to maintain the top spot in the English premier League is not an easy task, let's just watch how well arsenal would go about this their campaign this season, although I give it to them haven been this consistent till this time of the season, though Manchester city has have had their fair share of inconsistency this season too, so maybe arsenal could capitalize on that weakness by Manchester city to end at the top ranking of the league.
Arsenal are still one of the strong contenders in the league this season but we doubt they can survive until the end of the season after entering the second half of the season. Arsenal and Liverpool should be able to take advantage of Man City's unstable condition because currently Man City has a weak point after several players suffered injuries. Both Arsenal and Liverpool have to really take advantage of the conditions because the league is still quite long and if both of them are unable to maintain consistency then it is feared that when Man City shows another good game they could be chased like the previous season.
However I'm not seeing much threat from Liverpool or even Tottenham Hotspur, in any case the league is still open for Many things to still happen.
Liverpool have been a strong challenger this season to become one of the teams in the League and they are still consistent enough to date to have managed to occupy first place in the standings. This week they will face Man United and this will be proof of how strong they are to stay at the top of the standings because if they slip up, Arsenal will take over at the top of the standings. Tottenham were not part of the title race because they were only able to play well in the beginning, but now they have lost consistency after suffering several defeats.