$100 is difficult value for litecoin, but ltc is no need segwit in my opinion, the hype of segwit just give a short fomo for ltc itself. I think your speculation looks non sense.
SegWit adoption on LTC is not for block size increase. It will allow coders to add many other features to LTC. Maybe $100.00 in the short term, may not happen, but it's not inconceivable for LTC to get there.