The most recent episode of the Fox sci-fi drama hit a series low of 2.87m in the ratings, casting doubt on the likelihood of a fifth season.
"It sucks that it's a possibility of it being the end," Gabel told Assignment X. "We all hate it. You look at the numbers and you can only imagine what Fox is feeling."
However, he added: "There is a loyal fanbase and it doesn't drop below a certain number no matter what. People show up and watch it."
Gabel - who plays Lincoln Lee - described Fringe fans as "sophisticated" viewers, noting that many record the show to watch later.
"You see how [the numbers] change when people watch it on DVR," he claimed. "This show appeals to people who are technology-savvy and ahead of the curve. The problem is, the network doesn't know how to monetize [that type of viewing] yet."
It was previously reported that Fringe could return for a shorter fifth and final season, with a reduced budget.
Showrunners Jeff Pinkner and Joel Wyman later confirmed that they are still "hoping for the best" with regards to the show's future.
"We will find out like everybody else," said Wyman. "We don't fret about it because it's really out of our control. We can only step back and do our work, and therein lies the path to serenity."
Fringe continues on Fridays at 9/8c on Fox. In the UK, the show airs on Sky1.
> Lost star Rebecca Mader to appear in Fringe season finale
Watch a promo for the next episode of Fringe below: