It was obvious Protect was going to be the only solution going forward as soon as they announced it years ago. I can't fathom the surprise by anyone in that thread, because this is what they do with all of their products.
They announce the replacement, lie about not phasing out the current product, and then two years later phase it out anyways. This happens every single time and should not be a shock when it happens.
Next up is probably EdgeOS. That might be different just because a lot of ISPs use it, but they keep pushing UNMS and some of their new products require it (see their EA store).