The program has to acquire resources continually. You have to face that, identify what resources you need, and get about the business of gathering them. The conventional wisdom says you should always form a community coalition. The reality is that it's worth considering putting a coalition together. But sometimes the climate, the interest, or the leadership just isn't there, so you shouldn't do it until people are committed to sustaining it.
Some people are in the business of creating coalitions.
If it's the wrong thing to do at this moment for this particular goal, you're going to throw away a lot of time and effort and credibility. The conventional wisdom says when you form a coalition, you always want to be as broadly representative as possible. The reality is you can get stuck with the feeling that you can't get going until every conceivable group is represented. The quality of the people in the coalition is as important as the breadth. You need to have people who are truly committed.