Scientists very rarely use the end-all-be-all language of the news reports. I still hear people saying that the accelerating universe (a nobel prize discovery) is 'quite probable' not 'didn't you know, we solved that, stop thinking about it.'
There are whole branches devoted to disproving big bang cosmology. Are they right? Probably not, but their presence and arguments are extremely valuable. Disagreement is the founding, basic principle of science! It's what separates scientific faith from religious faith. Seeing scientists argue and debate each other in a public forum is the best possible evidence that the process is in fact working properly.