Tuchel will stay on because sacking him is very expensive, but also because he fulfilled with the main objective of the season: not getting knocked out at the last 16 stage of the Champions League. According to the French paper 'L'Equipe', that was key to him staying on.
It was something which has been taken for granted for days. Tuchel was going to stay even if the situation in the dressing room was not the best. Al-Khelaifi insisted on PSG making the quarter-finals of the Champions League and the German delivered.
The stoppage, even though it gave PSG a new Ligue 1 title, also affected their plans. The Champions League will not resume until August. Tuchel will be looking to lead the French side at least to the semi-finals and maybe even further.