We had
trip insurance for our cruise last year, end of August and into September, right in the middle of Hurricane Frances, and it DID cover expenses we incurred due to being not able to get back on our originally planned date. We foolishly paid cash for our meal at the airport (which was 2 days later than our original date) and for the meal on the plane. If we had kept receipts or used a credit card, both which are proof, then those meals would've been reimbursed to us. I've heard other people say their additional hotel nights were covered, too. We didn't have additional hotel nights because we were "stuck" on the Disney Magic. Believe me, I say "stuck" in the absolute best sense of the word

But
travel insurance DID reimburse us for some other minor expenses we incurred due to being delayed because of the hurricane. It falls under the "trip or travel delay" part of the policy.
Anyway, when you go to buy your travel insurance, ask about it, but I have never known hurricanes to NOT be covered. Maybe more people who traveled last fall will answer here, too, to give you more detail.
Another thing; I can totally relate to your disappointment in not being able to book the Polynesian lagoon view concierge for your stay! We weren't able to either, and our trip is the week right after July 4th. We actually arrive July 5th. So, we booked the Wilderness Lodge concierge for the first 2 nights, which really isn't too much a bad thing because my DH has always wanted to stay there, and I am looking forward to it too. Then after 2 nights we're moving over to Polynesian LVC
Keep checking, you never know if your dates will open up!