A single hyper-converged appliance can sometimes support multiple hypervisors, but you can't run multiple hypervisors...
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at the same time.
The primary barrier to simultaneously running multiple hypervisors is that the hypervisor expects to have full control over the server's hardware. If multiple hypervisors simultaneously ran on a single server, they would fight over resource ownership.
Another issue is the hyper-converged layer. While it's generally true that hyper-converged hardware comprises multiple servers, those servers are designed by the manufacturer to run a common hypervisor and a common management tool such as vCenter.
It is theoretically possible for a manufacturer to design a multi-platform hyper-converged appliance that allows a data storage administrator to assign hypervisors on a node-by-node basis. Such a system would likely be configured out of the box to support cross-platform management. Microsoft's System Center Virtual Machine Manager, for instance, is designed to manage Hyper-V servers, but it is also capable of managing VMware servers as long as vCenter is installed.
However, no current hyper-converged vendors offer such a system. My guess is that no such system will be created in the near future because the whole point of hyper-converged hardware is to offer a simplified, cost-effective environment that is guaranteed to work. A multivendor offering would increase licensing costs, complexity and the likelihood of compatibility issues in the system.
Another interesting way of looking at the question of multi-hypervisor support in a hyper-converged appliance is whether it might be possible to migrate from one hypervisor to another. Some vendors offer everything necessary to switch hypervisors. But storage architecture plays a big role in the ease with which such a transition might be made. Virtual storage appliances, for example, would be easier to connect to a competing hypervisor than proprietary storage directly controlled by the hypervisor.
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