give people the right to be greedy and they'll make use of their ability to be generous,
force them to be generous and they'll take every chance to be greedy.
thanks for sticking to your contract.
I think those are wise words. I believe people will donate adequately once an address to send to is made available. The foundation will be funded.
Some people might get motivated by the fear of failure "do or die" type of thinking but, personally, I'd be willing to donate more if I knew exactly how the funds were going to be used and I could see the funding goals gradually being met. Even a task-based funding campaign might be a decent idea where people can send to different addresses depending on which task/objective they consider the most important. Just an idea.
Ether way, I think transparency would be valued by the community so people know what they're donating towards. I don't think you'll have any trouble convincing people to donate as long as you can make it clear (in writing and visually) what the funds are necessary for and how the funding is progressing towards shared goals.