I think Klopp's announcement that he will leave the team this year is a bad statement because the race in the league is still going on. While this race continues, making such a statement without thinking that the players may be badly affected by this will have a bad impact on the players. In Liverpool, which aims to win the Premier League championship, the expectation will now be to present Klopp with the championship cup at the end of the season.
You have a point and this could affect the players as they battle for the top spot in the premier league competition. Jurgen Klopp have been a great coach to the reds after all the years he has spent, but maybe he should have allowed till the end of the season before making the announcement official to all. He can tell the top managements about his plan or keep them on suspense that he will decide by end of the season. After making this statement official, the players that likes him so much and want to always be with him as their coach will definitely feel weak but if they are all in for the future of the club, no side should feel affected by the statement but to make a good name for themselves by end of the season. Even if this statement will affect the players, it will only be for a while but they will bounce back and continue their fight for the top place in the league.