It looks like it's actually happening this time. How do you interpret Antpool signaling segwit on LTC while Jihan refuses to do it for LTC? Will Jihan finally give in and start signaling on BTC too? (although we would still be far anyway due 95% requirement..)
No, Litecoin SegWit was as close to inevitable as possible. Nearly everyone else is signalling for it. Jihan will have to give up eventually.
There has been an agreement, everyone is signaling segwit now on LTC so it will get activated, probably this period (even without Antpool, Antpool just will make it faster and guarantee it happens within this period).
As an LN developer, why bother with BTC when LTC will actually have segwit?
Because Bitcoin is Bitcoin. You could equally ask why the Core developers didn't all just flee to Litecoin ages ago - the answer is because Bitcoin is a huge network which needs development, while Litecoin is a much smaller network and is already very good.
How do you see all of this evolving in relation to BTC?
Well, confidence in SegWit could go either way depending on how well it goes for Litecoin. Since it'll be practical enough to work, people will probably support SegWit more in Bitcoin and in the very long term that could translate to an increase in miner support as well.