I agree that a tie vote isn't enough. But my best suggestion to the questioner and also to the person whose road association got disbanded, would be to have an informational meeting where the details of how a road association works could be accurately explained, and questions answered. It's possible that there are misconceptions that are making people not want to join.
For example, a statutory road association does not have the power to put a lien on anyone's property for failure to pay their assessment. A lien is a specific legal process that progresses on a specific time schedule and ends with taking the person's property. A road association cannot do that, nor would they want to.
What a statutory road association CAN do is file a "Notice of Claim" against a non-payer. Many people think of that as a lien, because it's a claim against the property. But all a Notice of Claim does is sit at the Registry of Deeds as notice that the owner of the property owes a debt to the road association for the road maintenance services which they have enjoyed without paying for them. If that owner applies for a loan or tries to sell the property, a title search will bring up the Notice of Claim, and before the loan or the sale can be completed, they will have to pay what they owe, plus possible costs. That's all. There is a huge difference between that and an actual lien.
Some people will simply pay what they owe when the Notice of Claim is filed, and that's the end of the issue. Some people refuse to pay. If it's due to a financial hardship, the road association should consider whether it's better to just have others pitch in to cover it. If it's someone who could afford to pay but simply refuses to do so, the amount owed may pile up year after year until instead of owing a few hundred dollars, they owe in the thousands. I've known several cases where the owner eventually sold their land, and paid the full amount then. It's also possible to take a non-payer to small claims court - but again, that would not result in taking the person's land - only in settling the debt.
Another worry people may have is that the road association will want to pave the road, which is going to cost members an arm and a leg. The road association statutes limit the assessment any owner can be charged in a year to no more than 1% of the municipal valuation of that property. On top of that, paving requires an affirmative vote of at least 3/4 of the members. So in an association with only half a dozen or a dozen properties, unless there are some really expensive properties, paving is unlikely to happen!
Bottom line - clearing up misconceptions about what can and cannot be done under a road association may be all that is necessary to get enough people on board. If need be, I or one of the other MARA Board members might be able to meet with your owners for a Q and A session to help things along. Or, if things are really contentious, you might think about bringing in a professional Mediator to help people understand each other's issues. If you're interested in either of these options, send me a private message and we can discuss.