Nobody stops watching because of bad broadcast crews so employment as a play-by-play, color, or sideline is relatively insulated from market-based corrections due to consumer taste, employee skillset, etc. With that said, live sports is a prestige product for the networks so their best crews are well-groomed and impressively well-prepared outfits (usually). There is a reason Beth Mowins has mostly been relegated to second tier at best broadcasts (usually 3rd or 4th tier): she's not employed due to her ability. She's employed as corporate message about equality. Considering the dues she's paid, Mowins ought to be doing their primetime ESPN game now but more often than not she's on the 11am ESPN/ESPN2 game.
Beth Mowins is not a good play-by-play. Pure and simple. Because her job is insulated from a demand for quality and it is really all about what the network wants to project, she has kept her job when many good employees (male and female alike) caught the pink slip.