Don't worry, many more are coming...
We certainly haven't witnessed the end of an era, just another (albeit large) round of consolidation within the marketplace.
There are 20+ new storage start-ups that are up and coming, such: -
VirtualSharp Software - Disaster Recovery Assurance (for virtual/physical environments)
Virsto - Storage I/O optimization (for Hyper-V environments)
Evostor - Storage virtualization (for VMware environments)