It is likely that LG’s next generation G series phone, currently expected to be branded the LG G6, will ditch modular accessories. The LG G5 did not sell as well as anticipated, and some theorize its under-performance was due to the unpopular modular accessories and possibly the modular design itself. 

Korean website ETNews noted that some

Source: Hot Hardware – LG Once Bitten Twice Shy Says No More Modular Smartphones Like The Poorly Received G5