I never understand why there is so much attention being pointed at the global crypto market cap - we all know that altcoins are insanely easy to manipulate and get their market cap to reach a value of billions and billions without much effort. The only market cap that matters is the one from Bitcoin, period. If we see Bitcoin Gold comes to life, it will very likely pop up with a market cap in the $5-10 billion range. In November we might be seeing another chain split, and then the same story will repeat itself. It seems that now the governmental pressure on ICO's is slowly but surely increasing, we'll see a chain-split-boom in the coming years. Malicious entities are very creative when it comes to finding ways to make big money, that has been proven already.
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.