I hope it reaches top 10. I know it's been on the radio a lot there (Popjustice mentioned something on Twitter about hearing it all the time) but I don't have too high expectations. Always better to be surprised rather than disappointed.
I'll watch this thread for updates but in the meantime I'll continue being a nerd on Pottermore.
It'll get a massive boost if it goes Top 10 because of the 'Top 10 effect' or whatever it's called. For example, if it appears at 10 and people see that on the main page, it'll generate more sales and could push it higher. Sounds dumb but it's worked for so many people.