Not a single person in the entire league would rather have Otto Porter than Anthony Davis. That's just absolutely ridiculous.

Let's take your example of moving from 30th to 25th to 20th etc. Let's say we start in 2012. This is the team that you would get with that style of draft:

2012: Festus Ezeli
2013: Reggie Bullock
2014: Bruno Caboclo
2015: Kelly Oubre Jr.
2016: Thon Maker
2017: De'Aaron Fox

There's a zero percent chance that team isn't just straight awful.

What you're suggesting just simply isn't possible nor practical. Even if a team keeps finishing last and the team moves owners and cities, the team is still behind the eight-ball and there's no way they could dig themselves out of that hole.

You mention that teams don't need a superstar to win a championship, but let me tell you this stat: Only one team in the history of the NBA has won an NBA championship without a Hall of Famer (or surefire future hall of famer ie Duncan, LeBron, Dirk). That team was the 2004 Pistons who had a Hall of Fame coach. There's no argument for that.