If it is on a builders contract the buyers rights will vary. It is best to work with a competent Realtor who can guide you through this and lookout for your best interests even if you are dealing with a builder. The sales agent at a model home represents the builder, not the buyer.
You'll have to look at the HOA governing documents and know what it states for homeowners. Who governs the HOA at this time? Get in communication with them to verify reserves, ability to perform, and consequences until the community is sold out and fully contributing.
Keller Williams Arizona Realty
What does the builder say? I am assuming that the builder still owns the development and is building and selling the homes.
If bank owned, different scenario.
If there is an HOA and you are the only one paying into it, there will not be enough money to perform the responsibilities of the HOA.
Too many possibilities to respond with a thoughtful answer.