If govt wants to amend Article 15 & 16, it requires constitutional amendment passed with 2/3rd majority and also assent of the states. This is unlikely to happen
If the govt breaches the 50 percent ceiling set by SC, it will be struck down by SC
The legal uncertainty of the amendment coupled with the fact that its unlikely to pass through Rajya Sabha substantiated the argument of Electoral gimmicks ahead of 2019 polls