I think this can be interpreted as Dash settling down to start a family being something that would "shatter" who she is now;Not pictured here is how the pieces would re-assemble themselves into a new Rainbow Dash. Not a world-touring Wonderbolt, but a family-pony - and, possibly, a future mother.Either that or AJ just blew Dash's brains out with an unexpected kiss, that'd also make sense.