I guess we're arguing semantics. I think Phoenix is screwed until 2030, not "well into the 2030s". Given the current CBA it's literally impossible for an NBA team to screw themselves for a decade.
Also, I don't think a 36-year-old Kevin Durant will have as much value as you think:
1. Age and injuries
2. He has a habit of forcing his way out of situations he doesn't like, It would be a huge risk for a contender to give up major assets for a aging player with a history of forcing trades. Not to mention KD is a free agent in two years.