There is a major problem with these ratings. Top nations will shudder playing against nations who are ranked much lower than them, reason being they are going to get very low ELO ratings. example Oman got only 2 points defeating India in World Cup qualifiers 2015 October. If those teams are not playing India now, when these ratingswill be enforced , they will hardly think of playing us. Teams are going to loose more than winning against playing weaker teams, and there will be hardly any scope of big improvements for such teams unless they are playingsuch high rated tournaments.
If a team has improved leaps and bounds in short term, it is not going to reflect in their ranking for long, even if theyqualify for the main events. The reason being, the difference in the rating points will be hug
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New FIFA world ranking methodology explained
http://www.goal.com/en-in/news/new-fifa-world-ranking-how-it-is-calculated/1xspsoo3o9j691wwm5i0mtpdbz
Here is the calculation
http://www.football-rankings.info/2018/09/fifa-ranking-september-2018-final.html?m=1