Splunk is a third tier tech company with Google, AWS, and Microsoft as tier 1, so you can realize the order of magnitude of their insignificance.
A stock value of $20 billion is not huge, given their primary product is syslog they don't have other products to fall back on. Their revenues are about $2 billion a year so if you multiplied that by 5 their real stock market value should be about $10 billion and not 10 times or more of their revenue.
They have to be bought out by a tech dinosaur such as Cisco who is a second tier tech company, in order to survive. You have to join a gang to survive that is the reality of living on Wall Street.
They will have to cut costs by laying off employees to make themselves attractive to buyers for their financials. Once bought the buyer will cut additional headcount such as for shared corporate services like accounting, HR, sales, and marketing etc.
Just enjoy it!!!