It could also take some time until it is an accepted site, so that you need to upgrade it several times over several generations. You basicly build a new site, with heavy costs in money, piety and time. This qualitative approach centers around the building of monuments. That said, I don't think the old system with the three sites needs to be removed, I think it should be complemented with a qualitativ approach. So I thought about, how to make it more apealing.
I find, and I think many do so too, that the current system of pagan reformation is rather bland, tedious und simply not very realistic.