I think that much of this concern over so many candidates at this stage is misplaced. This is the time for multiple candidates and views to be aired. As time goes by, the field will be winnowed and those who lose out will seek other positions, such as the senate seats she is urging. Running for president gives them the national attention that politicians tend to enjoy.
What we should hope for is that the field is winnowed by policies and the preferences of voters, not by the pundits and party establishments