I think the only way they could get enough interest to continue the series is if they were to market it on Toonami/ adult swim or something along those lines but its not really in the shonen/ action genres that are most popular there so it would probably be a hard sell
which really sucks because this was an awesome show with a stupendous dub cast and a perfect example of a great localized script which was able to take the spirit of the original show and localize for a more american market without running roughshod over the original show, i liked the fact that they even mocked the time difference between dates shown in the show from when it originally aired to the "current" time a couple years later when the dubs where made
I've seen all the episodes of Sgt. Frog, and a large portion of the subbed episodes of Keroro Gunsou. I've also seen all 5 movies (subbed) and the 3 Kero shorts (subbed); Keep in mind that the only episodes reliably subbed are 1-158, so you'll miss out on the Shurara Corps, who appear in 159. You will, however, get to see Garuru's Platoon, who appears in 100.
I recommend checking out the subbed episodes. What would be cool is if FUNimation at least acquired rights to produce official subtitles. This would be a good platform for getting more dubbed episodes.
The new Flash Anime is not being produced by FUNimation, rather by Animax. It is Japan-only, and I'm not sure what local channel it's on, but with some careful sleuthing, it is able to be watched. They're only 3 minute episodes, two so far, so I doubt they'll be dubbed. There are some fan-subs out though.