YLIMD is gonna be charting high most likely when RB is beginning to wear off. So it isn't really a liable threat at the moment. Wait 3-4 weeks, & then we can talk.
I am curious to see if Omg & HGM have staying power. I agree with someone else, Omg will likely stay. HGM might stay top 40 or something, but I don't think it will be top 10 for a long time. I wish both songs the best