I believe there will be a lot to be made with a long future in numerics. It's a perfect storm in domaining. The numeric era is different from all the others for a couple key reasons. One, they're almost considered "collectibles", comparable to collecting stamps, coins baseball, cards, etc.... Two, they have global participation such as with Asia. Three, numbers are more unique, and not an infinite selection as with words and letters. Four, it seems to only be limited to .com and .net extensions with having future value, thus increasing the value even more. I've been doing this 10 years and have seen nothing like this. Numerics have essentially replaced the need for creating new gTLD extensions.
Numerics being collectible is a huge impact. For example, I have a few good ones that I really just want to sit on with no intention of selling, similar to a collector mentality. That mentality will also increase the value as a lot of people may not want to part with them.
And to think, this is still the very very beginning in its embryonic stage.