When I see this, I kind of think what the author usually means is "Is X the new Rails?". Ruby itself was around many years before Rails existed, but didn't enjoy that much popularity. Once Rails became very popular Ruby became very popular.
Unlike Ruby, Scala has a potential to be a multi-purpose language (mobile, web, enterprise) - like C# already is (Scala is more enterprisy, C# is more mobile). Unfortunately Ruby's dynamic nature is a big limitation - both in terms of error checking and performance (e.g. for mobile games).
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