One major non-Biblical stumbling block removed, how many more to go ...
- women priests
- married clergy
- the whole Hail Mary thing
Actually that's unkind because the last 2000 years also saw - admittedly at the later end - Vatican 2, where amongst other things Latin was dropped as the sole language of churchgoing and the Pope admitted that actually other denominations were at least worth talking to. So, that's three points every two thousand years, giving us a worldwide church of unity by 6000 AD, tops.