Generally this isn’t a bad idea. It might be worth considering using Tarren Mill instead, primarily because, well, there’s already a guild centered around playing there:
While more RP hotspots are, of course, always great it might be better to initially focus on one spot, instead of spreading ourselves thin. Apart from the Guild “Tarren Mill” itself a bunch of other guilds are planning on playing in and around Hillsbrad, namely the Frostwolf Legion and the Survivors of Lordaeron (an Alliance guild).
That said, Brill has some things going for it for sure. Having a casual RP hub near the starter Zone might also help getting more fresh players interested in RP.