It's a question that might be well asked over at Dharma Wheel - http://www.dharmawheel.net/viewforum.php?f=77
- to hear what Mahayanists have to say about it (after all, this is the "Discovering Theravada" section, so of course Theravada includes the Pali Canon).
I doubt you would find many Mahayanists accepting the Abhidhamma PItaka (the third basket of the Pali Canon) as "the original teaching of the Buddha and is so to be use at least as the foundation for all traditions/schools", but don't take my word it... best ask them.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)