The Spurs are always good, but when Duncan and Ginobili go, I doubt they will maintain their current standard of success. Parker probably only has a couple years left too (at a high level). In a few years, they will be building around Leonard, who is a borderline star. Never count them out though.
The Thunder have 3 All Stars under 26. As I noted, Jackson and Adams are nice, young pieces too. Easily, the best young roster in the NBA, but I guess I'm a Thunder doog for stating so. If this team stays together for 5 more years, I would bet anything they win at least one championship, probably even 2 or 3 but championships are hard and often require a little luck. Getting rid of Scott Brooks and bringing in a better coach would enhance those chances.
The Clippers were good this year, and obviously will spare no expense with Ballmer paying 2 billion for the team. Chris Paul, Blake Griffin, and DeAndre Jordan are very good. I personally think Durant, Westbrook, and Ibaka are better. Paul seems somewhat fragile health wise, but his game isn't very reliant on athleticism.
The Warriors are a dangerous team. They might have beaten the Clippers with Bogut. I can't figure out what they really need. A legitimate 2nd star instead of Thompson and/or Lee is probably needed to be a legit title contender and not just a fun team that can win a round or two.
The Rockets need another big time player that will be tough to get. Harden and Howard have max contracts, and Parsons needs to be re-signed. Asik is making 13 million this final year, so maybe they can send his expiring and get a big money guy back (they tried to get Deron Williams earlier this season). I still don't think that will be enough for them. I don't like their coach, or Harden and Howards mindset. I doubt they ever win anything.
Portland is a fun regular season team. All offense, no defense. Next.
Memphis' organization looks like a mess. We will see if it's really that bad, but it doesn't look good. Randolph is getting older, they lack scoring on the wing. With some better wing scoring, they could have a chance. They are a good team, but not a title contender.
Who are these teams you guys are confident are beating the Thunder. The Clippers could. The Rockets or Warriors might be able to. The Thunder have been better than those teams for awhile though, and it's not like the Thunder are old. I get that we overreact in the moment to what happens in sports, but chances are, they are making the Finals. They will probably be the favorite of coming out of the West next year.