I don't usually pay attention to e-mails from youtube but after reading this I checked and sure enough, I got one of these notices too. I easily meet the hours watched but I only have about half the subscribers they want. I didn't make huge money with youtube ($20-$40 / month) but it was something. Definitely time to investigate other options. If they don't reverse this decision I'll be removing my videos from youtube as I upload them to DTube and/or whatever other alternatives I decide.
Speaking of alternatives, anybody got a list, preferably with monetization, other than DTube? I will certainly be trying DTube first. Are there currently any length limits on videos uploaded to DTube? I know there were initially but I haven't been keeping up... I've got 8 years worth of videos so this is going to take a while but after eight years I've uploaded my last video to YouTube.
DTube is definitely worth checking out. I've started testing the waters with some of my older videos and was surprised at how easy and smooth the process was!