I'm the last one to bad mouth a new round but, I have to say I don't know if the .45GAP will make it long term.
It's in a ''gap'' between the .40S&W and .45ACP that may not need to be filled.
It is a .45 caliber which makes it better, in my opinion, than the .40S&W but with reduced power compared to the ACP.
So to answer your question, I don't know.
I bought a 357SIG M31 that everyone told me was a bad choice but I love the round and think after many rounds down range that it is the choice for most defence situations.
Ammo for my preferred round is expensive so I bought dies and now reload for it.