There is a very apparent reason why altcoins exist: We don't need to come into one agreement, if some of us disagree with each other. Remember: coercion holds no sway in this space. I cannot force you follow my proposal for 100 MB block size. I can only implement it, and invite you to join.

Bitcoin is ingenious technology because it gives you the freedom to define it yourself. If you think Bitcoin has failed, it's because you've overlooked at this feature. But, let me ask you this question: What should the Bitcoin developers do, if not keep it "at certain version", as you claim? What should it change, in your opinion, so that it made it thrive?