Definitely. Rails is great as a starting point. By the time a product/company has started to 'outgrow' it then of course migrating away might make sense and the

Definitely. Rails is great as a starting point. By the time a product/company has started to 'outgrow' it then of course migrating away might make sense and there'll more than likely be a large enough team at the time to do the migration. A bit of YAGNI is clear here.