What it really means is that the market for software language is being exploited and usurped in order to maintain developer mindshare. The only really good reason to learn Swift is "because everyone else is learning it".
The most important, and sufficient, reason to learn Swift - or anything else, for that matter - is curiosity. I don't like working with people who are not curious about their craft.
Its really unnecessary to learn Swift -there are a plethora of other, better ways to build apps.
But if you want to keep up with the joneses - while delivering Apple a perfect 'big stick' to keep developer mindshare locked into their platforms - Swift is a pretty sweet deal .. for Apple.