I don't believe the 45 LC is about dead. It may not be as popular as the 44 but it isn't going away.
It can be loaded hot in the right guns. The Corbon loads are some real bruisers. I took a deer with the 260 grain bonded hollowpoint and it was impressive.
If I had to pick between them I would take a 44 for availability.
There used to be a short 45 too and that is why this round has the "long" in its name. It is still proper but not necessarily needed to address it that way.
Its a great and versatile round. It can do almost anything as long as you use common sense.