Does anyone think something based on something like SMOG readability to check grade level + something like uClassify [or some other machine learning API for age

Does anyone think something based on something like SMOG readability to check grade level + something like uClassify [or some other machine learning API for age:text correlation] would go a decent way towards fixing this? For sites that actually care about this sort of thing and aren't doing the legal minimum? [i.e. Take a 500 word sample from the user over their initial posts, test it against SMOG to see if it meets a minimum grade level. Test it against a machine learning tool to see if it estimates reasonable age. If it doesn't pass, disable the account and ask for ID and/or parental consent form]