There are still enough games for Liverpool to make a come back and revive their league hopes for the season. With just 14 games already played in the league this season there are 24 more games to play which should be enough to get back into the game and still finish in top four. I am not so much concerned about Newcastle being in the top four position because I have a feeling they will have a bad form and drop points.
In terms of the number of matches that are still quite a lot, it is still very possible for Liverpool to rise and get a better position. But that doesn't mean the others will be worse because all the teams also want to maintain their current position and try to keep getting up so they won't be easily beaten by any of their opponents. And I don't think anyone can judge right away that a team will perform badly after the world cup. For example like you said for Newcastle.
Right, even though Liverpool can recover, but if other competing teams can also maintain their performance and position in the standings, then it will still be difficult for Liverpool to return to the top four. Unless the competing teams or teams in the top four are currently unable to be consistent and continue to get bad results, then Liverpool could easily be back in the top four.
Also, I'm just reminding you not to underestimate Newcastle too much, because they have improved from last season and this season Newcastle can still maintain their good performance.
Therefore, with the good performance that has been able to be maintained by Newcastle, then of course I personally will not be able to doubt Newcastle this season. In fact I believe Newcastle will be able to be above Manchester City and may also be a strong contender in the title race.
Anyway, I personally cannot underestimate Newcastle because with them being the richest team, of course, Newcastle also has a big chance to become a strong team in the Premier League.