you can already get a greencard by paying less than $1mm in taxes. in general, your requirements are way higher than what's even required for citizenship. and green cards don't need a civics test either.
but I agree that it would be nice to have a less fraught/complicated path to permanent residency.
> you can already get a greencard by paying less than $1mm in taxes.
Not really.
Your only generic option is EB-5, with $750k in direct investments. However, right now it takes 3 _years_ to process the initial application (https://egov.uscis.gov/processing-times - look at the I-526 form). And after the initial form is approved, you need to apply for the actual green card, adding another 1-3 years.