I'm not aware of plans to revoke already provided licenses, nor to block anything.
As of licensing, it depends on the usage.
For private home labs, you may want to take a look at the VMUG Advantage program.
For other usage, you'll have to license the host based on it's cores, with a minimum of 16 cores per CPU. For a single ESXi host, the least expensive option is likely the Standard edition.
André