Faria don't want more team for validate reason (more game would just plsit the fanbase and make a burnout), 20 is too mush, 2 ascended team is not enough, 16 is a good compromise because it make easier to make a format for the kickoff, a mix between swiss and double elim would be optimal (you've got 4 team with 1 loose and 3 win after 4 round)
One of my weird dream is to make less round in a side (10 or maybe even 8), for making slightly shorter game and allow more team without up the broadcast time (and allow more BO5, and make soloQ a little bit less, and reduce the number of round for a remontada and give more suspens and many other reason to be fair), but thats just me being weird