A time will come when multiple forks and mutliple splits occur , then a centralized blockchain could happen or a term like what can be called someday as regionalized blockchain or a standard blockchain. Like, if 2 or 3 network splits from bitcoin blockchain exist, we may assign their link in a contenintal manner like, Asia-Pacific region blockhain, American blockchaim or European blockchain or a hybrid cross-link blockchain. As we know blockcahin was still an emerging technologies and an open source so there's a possibility that some standards would vary from region to region, government want to regulate cryptocurrency and government wants to implements standards, this notion is still debatable but might happen someday who knows. Just like cars, their design was copied(same thing as bitcoin and bitcoin fork), you can see cars for american market, cars for european market and cars for asian market. These cars have different driving standards like the Right Hand Drive and Left Hand Drive standards. So this could happen in cryptocurrenvy blockchain too.