This is a case where satysfying a wish cause problems to others.
In my opinion the rule should be this:

at every boot there's a check on every 70-persistent-net.rules entry:

if (MAC(entry) is kvm/qemu/wmware type
        && the entry was referred to a card card in the PCI bus (read: not used 
often for hotpluggable devices)
        && MAC(entry) doens't exist anymore)
    delete(entry);

Just disabling persistent net generator is, in my opinion, against the purpose 
of udev and it's causing troubles to users that liked the behavior of seeing 
the 70-persistent-net.rule to be autogenerated on delete.
But I think udev is powerful enough that we can find a solution that satisfy 
"everybody".

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https://bugs.launchpad.net/bugs/802538

Title:
  /etc/udev/rules.d/70-persistent-net.rules not automatically generated

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