Double leg wrestler takedowns were the staple in the earlier days of MMA. It is pretty easy to stuff if you can see it coming and there are less than a handful people man or women, competing in MMA that can apply them at will.
Best and the most succesfull wrestlers who won championships and were not plagued by being mind numbingly boring while they wrestled are Dan Henderson and Randy Couture and they both prefer clinch work and takedowns to shooting from one side of the cage and landing with your opponent on the other side of the cage trying to get your head out of a guillotine. Even Chael Sonnen who has a sloppy less flash looking but an extremly effective double, executes more clinch takedowns since they are usually harder to stuff and once they are stuffed you are not stuck under the guy.
Every passing day I see more clinch work and less outside freestyle wrestling takedowns so Judo could esaly be the next side martial art added to the regular training regimen of an MMA fighter.
Also understand one thing. MMA fighters do not train wrestling so they can take their opponent down. Most fighters who want to use their wrestling for takedowns are already collegiate wrestlers. The majority of the MMA fighters learn wrestling as a defensive technique and be able to have solid top control. It is very similar to Pat Barry working on his Jiujitsu, he is getting good at it, but reason behind his training is not to flap like a fish out of water when he is on the bottom.