I don't think you read Mags' post very well. He wasn't presenting a "best case scenario". He was suggesting that the change in bigs alone might be worth 10 wins (which is clearly a stretch), ignoring every other aspect of our perceived improvement.
However, we (the "lemmings") also expect improvement via Williams as backup PG, Wright as backup SF, and Lillard's natural growth, not to mention (at least for me) the fact that LMA will be healthy all offseason, meaning that he will start the season in better condition than he did last year.
If I were to assign expected win increase values to those improvements (as in, how much better would last year's team have been if these things had been there then), I would probably do so thusly:
- Lillard's progression: 4-6 wins
- Lopez/Robinson: 3-5 wins
- Williams: 2-4 wins
- Aldridge ready: 1-3 wins
- Wright: 1-3 wins
I think I'm being pretty conservative here, and I'm giving us a minimum 11 win improvement over last season. Based on that, I feel very confident about us being a playoff team this year (barring catastrophic injury, of course).