Word Order and verb endings (was Re: No Proto-Celtic?)

[Kreso Megyeral]

According to Gabor Sandi's observations on Hungarian verbal and nominal
system, I would like to ask what is general opinion on theory that PIE had
the opposition between indefinite and definite conjugation, as Hungarian
does. Some of the linguists interpret thematic vowel in declension and
conjugation as some kind of suffixated article. The theory is proved by the
fact that there is no intransitive thematic vowel of undisputable IE origin.
Your attitudes?