Are there any contentious BIPs, that could force another block-size type war?
I believe that we do need a hard fork to increase the block capacity at some point, I don't know if it will lead to another long drama though.
I also believe that hard fork increasing the max block size will occur over the next 5-10 years, and it will be much more contentious than the segwit fork and lead to a protracted soul-draining war. The saddest part is that although everyone will agree with the technical merits for a size limit increase, the strongest objections will be based solely on small-blocker dogma.
I believe the end result will be a permanent split similar to BTC/BCH and ETH/ETC, with Bitcoin (BTC) taking the branch with the bigger blocks.