We run the same way. Everything on one VM (2 CPU, 6GB RAM). According to VMWare this config is supported for up to 5 hosts and 50 VMs. We are a little over that with no real issues. If your performance starts to suffer I would recommend moving the DB to a full SQL server first. That is the biggest bottleneck of this setup both because it is sharing the resources and because the express edition of SQL only allows for 4 data connections.
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