I vote yes for parent coaches.
Parent coaches bring a passion for team success that $$$ can't buy because it directly effects their kids' happiness. A parent coach will be more inclined to build a more stable team because they have a personal commitment to that team and its success, not to the club. They are there for the duration; consequently, it is to the parent coach's benefit to do all he can to improve your kid, thus, improving and stabilizing his team. If your kid benefits for a year or two along the way or rides the team all the way to the end, great for him. It doesn't work out for everybody.
Just go down the list of PRESENT coaches in WPFC that are coaching their kids or did in the past, there are at least seven including Olney, one of their directors.
The dad coach of the now defunct Blasters put them in D1, and kept them there, with no soccer background, experience or license. He was still recruited to coach for FC United. What made him successful...? ... enthusiasm and passion and a desire to build the best team around his kid that he could. From a club perspective, that parental instinct for preservation of their offspring can be used to build some pretty good teams. Many of the FC Royals teams were built that way in the era before paid coaching, O'Brien's United team, Black's WPFC team, Crook's Santos team. Independents like the Parrots also come to mind.
PS: Heard this year's WPFC BU18 Black team folded up recently. Sent those Blasters boys hunting for new teams. It takes passion to hold teams together, not just money, rules, and ultimatums.