I doubt it will ever become as mainstream as Rainbow Six, but it don't have to either. There are online games that survive and grow without such a big playerbase, or that grow slowly but steadily over time. Warframe had less than a million unique users for it's first year, and is still alive and growing 5 years later.That was their hope yeah, to support it for a decade.
It could become a Rainbow Six Siege though and turn things around when enough new content hits.
We don't know less than two months since launch what will Sea of Thieves become in the long run. If it will fail/suceed or simply survive will depends on Rare, but one failed patch is hardly going to make much difference.
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