A smaller domino can topple a much bigger one, which can topple a bigger one and so on.
Amazon perhaps, though they have successfully penetrated enterprises.
I suspect Sun was walking dead long before the crash, and wouldn't have survived without an existential shift that it's not clear they were capable of making.
The silly money in the dot-com run up just dragged the process out a bit by masking/hiding the crisis, but I don't think it's correct to say the crash is what killed them.
I'm more concerned for startups that are early-phase watching their market evaporate, or are selling shovels to the now non-existant gold rush.
Growth has been stellar, but what the numbers don't tell you is that the growth is simply achieved by subsidizing users. Delivery is completely free, prices are discounted, and they'll deliver any amount. I know people who will order half a dozen times a day for something as small as a pack of potato chips and a coke (order value: $1). Because why not if you're getting it for free?
What happens to these startups if funding dries up and free delivery is off the table is anyone's guess.
"Survival of startups", plural, is not the metric of relevance. The strong will survive. The ones who were/are running on fumes are gonna have a bad time.