The ones staying with VMware, permanently or near term, are likely using products for which there are not good replacements. The open source alternatives can do

The ones staying with VMware, permanently or near term, are likely using products for which there are not good replacements. The open source alternatives can do what ESXi does sure, but its progressively more difficult to replicate VSAN (including stretched clusters) and NSX-T (with distributed firewalling) without bringing in multiple vendors that will all point at each other when there is a problem.