Thanks for adding some backstory to your question, @KhailTowers. As others in this thread have already said — don't worry too much about the I-864. If your marriage fails in the U.S., it will be messy and expensive anyway. The I-864 won't add that much cost and hassle. And in any case, the I-864 only creates an obligation towards the U.S. government, not your wife. Her brother can't make her sue you based on the I-864.
If you feel like going ahead with your marriage and with moving to the U.S. I would recommend two things to mitigate the risk I:
(1) Talk with your wife and develop a joint vision of your life together that includes all the important points — kids, living situation, domestic work split, finances, retirement. That's the best way to prevent your marriage from breaking apart.
But also:
(2) Once your wife is here, support her in finding employment, developing a career, etc. The I-864 is moot if she makes her own money.
Does your wife work? Does she want to keep working in the U.S.? If you keep moving around for jobs — are you expecting her to follow you and put her own career on the backburner? If you two want kids — is she going to stop working and take care of them?