The Cowboys game tomorrow against the Rams does not have any bearing on the team making the playoffs, none what-so-ever. The Cowboys only need to win their last two games to make the playoffs.
As for Dak Prescott, he is a leading passer in the league. His statistical improvement as a QB in 2019 in incontrovertible. Should he have a statistical bad game tomorrow, his status as the Cowboys starting QB will not be in jeopardy in any way.
Fans seem to confuse their own personal agendas and opinions of the team and its players for something that bears real consequences for the team. If you decide to share your personal agendas and opinions of the team and expect them to be taken seriously, prepare to be disappointed and mocked. Opinions of the Cowboys by its fans are as varied as the stars in the sky, so no matter what opinion you have, there is someone out there that disagrees with you.