No, the more the worse.... Less money for any one candidate (unless he/she self-finances the run); fewer volunteers as they are split between different campaigns; increased agitation between voter blocks; more ads with more criticism of other Republicans (which becomes GREAT fodder for the future DEMOCRAT opponent!)... Furthermore, dissociated supporters of the losers sometimes do not get behind the winner but carries the disappointment by not voting at all in the general.
The real consideration is the number of independents and how they lean in this race. Will they even bother to show up? The greater the turnout, the better for the Reps given the history of this district.