If their goal is to oust Ami, you can be sure, that if c”v successful their price will rise higher and service lower. No different than the established airlines selling dirt cheap tickets anytime another airline offers the same service. Then, once ousted, their price hits even higher.
At one point a cheap airline started offering decent priced tickets from NY to Pittsburg. The established companies, Continental.. lowered their tickets to $70 round trip including all taxes. Once they re-secured their route prices were higher than before.
Competition is good, for many reasons.