There are dozens of options, and the best advice anyone could give you is to discuss it with an attorney who deals with trusts and estates.
Obviously, everyone should have a will. What many people don't realize however, is that having your assets distributed via will means probate, which means a LOT of time and some expense. Also, any assets in your estate are obviously potentially taxable, depending on the size of the estate and your state laws.
The two primary strategies for avoiding probate are joint ownership and trusts (or corporate ownership).
Joint ownership is an option, but as others have mentioned, there are questions and potential issues for your heirs if they are not really in a position to assume ownership of your DVC.
Our DVC is held in a family trust. A trust works well for us, but it may be an awful choice for you. That's why you need an attorney.
If you're considering a trust, you have to remember that a trust is just a piece of paper until you title the assets in the name of the trust. Trustees have no authority over assets that are not owned by the trust.
If you have a trust that says "I want my DVC to go to my kids," but the DVC account is titled to you, you really just have a will by another name, and the DVC account is probably going to end up in probate.