I don't know if Chelsea will win the Premier League title next season, but I am certain Chelsea is a strong contender for the Premier League title next season, and if Chelsea can be consistent in winning their matches in the Premier League, I think they will have a chance of winning the Premier League title next season because Chelsea has good squad depth now.
You have said it all, their consistency is what's really going to matter in the coming season. Like I said in my previous post that all 20 teams in the premier league right now are serious title contenders. Even the newly promoted Sunderland if they are consistent in winnings their matches, they are also likely to win the premier league. After all Leicester city did it in 2016. So consistency is the key as you have rightly said.
I wanted to laugh when you said that the newly promoted Sunderland are also a favorite to win the Premier League title next season, but then I remembered I said that if Chelsea are consistent in winning their matches next season, they will win the Premier League title. I agree with that; the newly promoted Sunderland are likely to win the Premier League title next season if they are consistent in winning their matches next season.
The Premier League has had a crazy growth and it is normal that the teams that come from that championship are a step ahead of the other big European ones but we must not forget that other championships will also be providing excellent contenders to win the cups, England is certainly the favourite for the number of teams and for strength