They will be fine as long as the government doesn't cut their money or decreases it. They can find ways to survive by living within their means.
If they have full grown kids and their kids are looking out for them, houses all payed off, bills already taken care of and your SSI money is enough to feed yourself, that is all they need.
It is the retirement living. Now if they are struggling, they need to go back to work for them checks.