It isn't about getting consensus, its about a centralized power structure pushing changes out to the network.
Except that there isn't a centralised power structure at all. The only thing the BCrash Coin devs can do is push code. They can't force users or miners to run it. That would be like making the equally fallacious argument that Core are trying to create a centralised power structure just because they have some ideas they'd ideally like to push forward with. Whichever chain you're talking about, providing it's open source, the developers can't make the decisions alone.
It certainly makes a difference when the only software available
There are at least four: Bitcoin Unlimited, Bitcoin Classic, Bitcoin XT and Bitcoin ABC are all full node implementations which support Bitcoin Cash.
Its good for one thing - dumping for your own currency or changing it into BTC.
As it is, the majority of Bitcoin Cash users support large block sizes, so it's certainly likely that they will have hard forks in order to increase the block size when they perceive it to be necessary. A BCH hard fork with an increased block size is quite likely to gain consensus.