When faced with such discussions about small companies being higher risk, I'd trot out Sun Microsystems, GM, Chrysler, etc.
There is risk. There is always risk. Risk has little to do with size. It has a great deal to do with management, capital, ability to acquire and keep customers, etc.
As a "startup", we were in business for a decade with revenues of several million per year and growing around 30% YoY, successful/stable products proven in the field in which we were selling them. Dominating in most of the technical and support aspects compared to competitors.
What I found was that the people claiming "too small" were simply conflating larger/well known brand name with reduction of risk. This bias exists throughout this industry, and has for a while. The old "nobody ever gets fired for buying IBM" is a historical example of this.
Yet, when the market feces hit the fan, IBM was infamous for leaving the very markets that they had troubles in.
Google is infamous for its killing off things, effectively at random.
I could go on, but the point is that large well known brand is not synonymous with low risk. Rather the opposite.
But, I'm out of that market and that chapter of my life has been completed. Now that I'm in a small but growing company, it helps that I can see things from this side, in that I still see reluctance to consider worthy technology. Risk aversion takes many forms, and often the decisions made do little to mitigate the risk. Rather, I've seen it concentrate/increase said risk.