Startups are going to get most of their deposits back-- perhaps all if there's an acquisition. If SVB is not acquired, I hope the FDIC is able to get a substantial dividend quickly so that they can keep operating and that everyone works to keep disruption low.
But I don't think the federal government needs to make depositors whole beyond the insurance limits. I think that sets its own bad precedent. Maybe some startups are going to lose 5-40% of their cash because of their treasury management choices. That is OK.
The times when I was a founder of a startup with a substantial cash balance--- we hedged the bank risk. There was a cost to it. I don't think those costs should be socialized.