These people will try to hijack bitcoin brand and even attack bitcoin with spam transactions and DDOS services.
As I just pointed out, BCC is
not an attack on Bitcoin. Anyone can create a fork of Bitcoin - if they were all attacks on Bitcoin, Bitcoin would have died long ago.
As for hijacking the brand, there is
some merit in that argument - but I think that people are letting their opinion get in the way of a neutral judgement. When the similar fork
BitCore happened, people did not perceive it to be an attack on Bitcoin, but by this poor logic it would have been.
i just want to add two things.
1. i agree with your points but they should not be confused with what some are currently doing to take over bitcoin. with threats, with their money or hashpower.
There is
nothing that Bitcoin Cash could do to "take over" Bitcoin. The two chains will act solely on market forces. Even in the unlikely scenario that Bitcoin Cash ended up with a higher price, it would not have taken over at all. As for hash rate, it will eventually move along with the price when there are two chains, sooner or later.
I try to comment only on you last point - I do not want this single dev team to be fully in charge (off all points see down) - this is too much pressure and too much a single point of failure!
As long as the code is open source and anyone can contribute to the development team's code, it's fine for one team to develop the reference client. There should definitely be competition and people should definitely recognise that other clients exist, but there are problems with having too many implementations at once.
Satoshi mentioned this as well:
I don't believe a second, compatible implementation of Bitcoin will ever be a good idea. So much of the design depends on all nodes getting exactly identical results in lockstep that a second implementation would be a menace to the network.
What people need to know is that development teams do not have real power. Development teams just develop, and Bitcoin users/miners/nodes decide what code to follow. So different proposals do not need the support of Bitcoin Core.