I think this would be cool, but it would also be a bit of a pain I think. Because sometimes people want to keep it secret that they are youtubers just in case someone decides to go and punch them to death (I understand they would want to advertise though). Maybe have an option to hide it?
Also, I think 1000 subscribers is quite a bit. I'm pretty sure there are only 3 or so. BajanCanadian, JeromeASF and Blamph. Nate hasn't quite reached it yet, neither has Sidera1993 (who doesn't play MCSG much, but does sometimes I'm sure because she has a video of it. Also, she might have by now seeing as she was almost there last I checked) and Vebbi is at about 500 subscribers. I think 500 would be enough for this if it were to be implemented though.