I don't know why is it so bad that Country might dominate next decade..... The late 90s and early 00s we had the boom of Teen Pop (Britney, Backstreet Boys, Nsync, Aguilera, Justin Timberlake, etc.), mid-2000s we had a hip-hop/rap boom, late 00s electro-pop emerged, so it's natural that something new will appear and "dominate", and if it's Country I'm ok with that, We survived the ghetto rappers era (not that I didn't like them, cause I actually like Eminem, 50 and Lil Wayne) and we will survive Country era...
I don't think country will ever dominate. The progression from teen pop to hip hop was natural, because it was a dirtier version of the same sound. Are we ready to make the jump from beats to twang? I don't think so. I've met so many people in my life whose favorite music is "everything except country." I think there's just too much hatred for it (and too many old white guys dominating country radio).
The labels will never let country become huge. Country songs are popular just in the US and even in the US just a few country songs every year become hits. The labels are gonna invest on songs that can become international hits.