the fanbase is big enough, there are orgs there, I personally see several problems
A) Who goes to the now formed VCT NA? 100t, c9, sen, eg, nrg, g2 are all there, problem is that their financial situations can change in months, and I don't see many orgs joining in, or the ones which join are doomed to be the bottom feeders to the big dogs
B) Why would riot go for extra expenses on hosting the entire 5th region? If riot deemed it profitable, I am sure the VCT Calendar would have more than 3 events per year