Liverpool are currently in first position, and am sure they will be able to maintain the first position till ending of the season,
The luck that Liverpool have is that they have already established a very good lead on the Premier League table so losing at this point is something that is going to be very difficult and impossible. Even if they don't do well, they will keep heading to win the trophy even if they draw games. This remaining side of the season should be a time for the Arsenal coach to plan for next season because his team definitely needs a lot of squad depths to be able to compete to win the Premier League. And the longer he stays without being able to win the Premier League the harder for him and the slimmer the chances for him to keep his job.
Liverpool has already dominated the title of the Premier League this season, and even if their performance is poor for them to draw all the remaining games, they will still be the champions of the trophy, and we all know that that will never happen because their performance is very good to be met up by Arsenal this season, so Arsenal is no more a threat to Liverpool, but they will also have to work on their performance next season just as you mentioned because last season they also finished the season as the second in the table, and that is the same that is going to happen this season. At first, when I saw Manchester City, I thought they would have a very challenging season and that Arsenal would be the winner, but their performance is not that consistent, which they have to work on to see if they will be able to achieve the trophy next season. But for this season they will just have to lose hope and accept defeat.