"It's good for them, (and) it's good for us, so I'd like to see that (Super Rugby Pacific) continue.
"It's got some the best players in the world. You want to be playing the best players. That's how we'll get better and be challenged.
"We've just got to make sure that financially it's beneficial as well. I'm supportive of the competition continuing, but that's not my call."
Three Australian teams – the Brumbies, NSW Waratahs and Queensland Reds – reached the Super Rugby Pacific finals series.
But with the Reds and the Waratahs being knocked out in the quarter-finals, and the Brumbies losing their semifinal, Rennie was able to call on his entire 35-man Wallabies squad for the start of the camp last Thursday.
"From our point of view, it's good that we've had a little bit extra time together, but we certainly want our boys playing in finals," Rennie said.
"The tougher and the further they go on in competition, the better."
Rennie said there had been no discussion in camp about moving star flyhalf James O'Connor to fullback to cater for the presence of fellow playmakers Quade Cooper and Noah Lolesio in Australia's squad.
"It's a chance, (but) we've got a few fallback options even within the squad," he said.
"Tom Banks plays it (fullback) regularly, Jordan Petaia's played a little bit, Andrew Kellaway's played test footy there as well … I'm not saying it's not possible, but he (O'Connor) hasn't played any fullback this year (for the Reds)."