bitcoin isn't gonna down deeper unless there are some of the major bugs in bitcoin.
Wait for the first roll-out of RBF. Not bugs per se, but new, unique gaming opportunities for the clever scriptwriters.
Mind you, they are in such a panic to rush this through, I'm sure there will be some fun bugs too.
RBF could be the 'killer-app' that the alternative clients need to gain traction. With less than 40% on the last core update, it will be interesting to see how many bother.
RBF seems to be a necessary ingredient for LN. Can anybody explain how?
No, LN does not need RBF. LN only needs BIP68, 112, and segregated witness