"The important point is not to enter cessation for the sake of living beings."
In Amaro's article there's a good point about this, "So if we’re hanging onto the Southern idea of “me going”, and “others being left behind” then that idea, by definition, is missing the mark. Similarly, if we cling to the Northern view and think, “this individual being will persist through infinite time for the sake of all beings,” that has also fallen drastically into wrong view." That is, the concept that there is a cessation is one extreme, the concept that there is remaining around is another extreme. In the Pali Canon the Buddha doesn't give a definition of what happens after parinirvana as it doesn't make sense even in this life to pinpoint someone in nirvana (as an arhat, as the Tathagata). In the Prajnaparamita texts it is emphasised again and again that a bodhisattva actually is not a bodhisattva, doesn't go anywhere, etc. Sure, there's then where the sutras got all systematised and the arhats just puff away and bodhisattvas and buddhas are eternal beings - well, this is actually how it all gets simplified and becomes easy to oppose non-existence with existence. Thus reconciling one extreme with the other is impossible, unless we point out that those extremes are wrong views.
"if you can point out to me where a Srvakayanist would develop the intention to free all living beings"
Does a bodhisattva have the concept, "I will free all living beings"? I doubt that. Does a bodhisattva actually free all living beings? Obviously not. Then what is bodhicitta and the vow?
"While teachers of the middle way, mind only, transcendent wisdom, mantra, and other schools may have their own assertions, the fulfillment of those intentions is the same. There is not a single thing that is not contained within mind."
(Gampopa to Düsum Khyenpa, in "The First Karmapa", KTD Pub, p254)
“If you recognize the world of appearance and existence as the mind, realize the mind itself as empty, and have no grasping at the superiority of your realizations — this is the ultimate view."
(Chegom Dzongpa, in "The Book of Kadam", Wisdom Pub, p609)