The money will definitely slow down if the return from the industry as a whole (the industry being SaaS and web apps) is less than the investment levels put in.

The money will definitely slow down if the return from the industry as a whole (the industry being SaaS and web apps) is less than the investment levels put in. It's worth remembering that while the initial investors in Facebook have seen amazing returns which will subsidise other investments for decades to come, those returns are only because the hype in the industry as a whole has lead other people to buy into facebook. Facebook itself has fairly low revenues and they're struggling to grow them. Equally while anyone who'd invested in instagram would have walked away with a nice sum, the money to fund that acquisition came from the same Facebook investment. There's a lot of hype about "tech" (in this context really only web apps) which has lead to a lot of money pouring in from people desperate to grab a slice of the pie. The reality is that while web apps and SaaS is a large industry, the size of the investment funds targeting the industry is due to hype and investors saying "me too" rather than a reflection on the available revenues. You have to look at even the success stories in this context. The money won't run out completely, but if the money from investors late to the party slows down then the value of the successful web apps will fall to levels which reflect their revenues.