NASDAQ took 15 years to recover the .com crash?!

During the dot-com crash, the NASDAQ dropped ~78% from its peak in March 2000 (~5,048) to its bottom in October 2002 (~1,114). It took 15 years (until 2015) to fully recover back to that all-time high!

Given that tech valuations are very high again (Al hype, mega-cap concentration), what are the odds something like this won't happen again? 15 years is a long time to recover back to ATH, even something half as bad would be brutal…