We have a 529 for our baby - easy, simple to use, and tax free growth. If you have the money to dedicate to a college fund and would like to save for college, a 529 is a great option. I am generally a huge fan of using all available tax sheltered accounts first for savings before putting additional funds into other non sheltered accounts.
However, your question seems like it is about whether it is worth it to save for college period. I would save a bit, regardless of your anticipated low income. Extremely strong/high performing, poor students do often get substantial aid, but it is actually not the norm for them to get full rides. They make up the difference with loans. For every low income kid who gets a ton in aid, there are many more who only receive partial or meager assistance. I think it is risky to completely bank on the idea that your kid will be one of the lucky few to get the majority or all of their college funded by the school or government. If you are okay with your kid covering a majority of their college costs, even if that number ultimately turns out to be very high, then you can definitely take your chances and avoid saving specifically for college (either through a formal 529 or through additional savings elsewhere). But if you do not want your child on the hook for covering a substantial portion on their own, then you really should save somehow.