I don’t understand what you meant by they deserved it, they performed well in my opinion and they deserved a better result but to win the premier league you just have to be the best and clearly Manchester City was better than them. I am not an Arsenal supporter but i feel bad for them after doing everything right they still failed to win the league for the second consecutive season.
Don't you think Arsenal deserved the Premier League title as much as Manchester City? This was my point. Losing only one specific game on the final weeks caused them to hand the title over to Manchester City.
Yeah they have to be the best one next time. But having such a solid season the last time makes me more hopeful for their next time. They have been improving their results better for two seasons. If it happens again then it should finally end up with a league title.

Arteta shouldn't leave Arsenal before making them champions at the same time. It would be a tough task done with such young players while not having the best squad.
They deserved it because they have performed well but if they can’t maintain consistency till the end it’s of no use they will just keep trying but they won’t be able to win the title. The games played towards the end of the season are the most important games to win so if they are unable to win them it means they are not fit to be champions. For two consecutive seasons they have failed because they couldn’t win games towards the end, if they can they will definitely win the league someday.
I think if they don’t try and win it soon they might find it difficult to because the more time they waste the more teams will get used to their strategy and style of play and the more difficult it will become for them.