I don't know if the term 'crash' has a formal definition (for me personally, I would define it as a 25% fall or more in less that 3 months); but I think we will experience a number of 'corrections' of about 10% within the next 5 years.

Well, software already had a ~25% repricing last February, and plenty of SaaS names were down 30–50%. Now for that to hit the whole stock market at once (not just the Nasdaq), I guess you'd need some sort of macro / liquidity event or black swan. High valuations alone just won't do it.