New rules will cause some division, but not a significant division. In some contexts it will be the same, groups playing new OD&D rules and groups sticking to the original 5e, but due to the fact that they're compatible, it will not be a significant division.
Judging by what I've seen in the playtest docs, I think it will give 2-4 years more for this edition until players get bored. So far, and because Wizards is committed to keep compatibility, OD&D will not change a lot of stuff. Adding or fixing classes, races, feats, spells and so is more like applying some patches or installing DLCs than new rules.