I have to disagree again, and go with Filoni...
I think his point expands to movie aliens overall. You can only show movie aliens so much before it looks like all the SW galaxy is made up of, is aliens we saw. In a galaxy of "a million million worlds" (Lucas' explanation of the SW galaxy's vastness), you're going to see a LOT more aliens not in the movies than the ones you do see in the movies. As it is, I thought we saw too few new species in the Prequals.
So I see where Filoni's coming from there. The lizard guys were fine... I liked the fishy Senator guy from the Droids episode, and the street vendor. Then there's the DJ in the Hunt for Ziro... You should though, in theory, see a lot more aliens we've never seen than constantly see the ones we've already seen time and again (ROdians, Ithorians, etc.).
I do think some more from the Cantina should show up, but they've snuck them in too... Gotals have shown up now for instance. Quarren have made their appearance... Hell, we've seen Rodians, Quarrens, Mon Calamari, Nikto (but not green Nikto, which would be nice), Weequay, Gotals, Gammoreans, Twi'Leks, Ithorians, Aqualish, Duros, Muftak's crew (though not Muftak's crew out in the galaxy), Jawas, Hutts...
And that's not even getting into Prequal aliens we've seen like Baron Papanoida's species and such.
Making up their own species to avoid redundancy on the show, but also with the films, seems like a pretty good idea I think.