If Bitcoin, in any form, effects the sort of large scale change on the financial system that it is capable of, even to the point of grabbing any substantial market share whatsoever from traditional payments people, Visa, PayPal et al, that is still going to be worth a good pile of cabbage.
I am not arguing that Bitcoin won't go up in price (although it is remotely possible it could be entirely defeated by an altcoin, the more likely future is Bitcoin prospers while an altcoin might also due to a bifurcation on the principle of strong anonymity).
I am arguing that we will lose our decentralized currency and anonymity.
Bitcoin : The Digital Kill Switch
You might accrue large capital gains, but I am also arguing the government is going to confiscate our gains any way. See this post, the Mad Max and the Economic Devastation threads.
In my opinion our biggest problem is financial survival going into a coming horrific global sovereign debt implosion (2016ish running for a decade or more of hell) that will force the governments to confiscate everything they can get their hands on.
And we need decentralized currency and payment in order to prevent the internet from being dominated by an advertising funding paradigm and few large corporations. See the MtGox demise as a prime example of how centralization leads to failure and/or government control.
In short, I argue we are threatened with losing freedoms we gained with the internet and worse...
And I am not going to let that happen.
For example did you know there is a government push towards mandatory Facebook accounts, and that Facebook is even recording your pattern of typing so they can identify you even when you are not logged in!
We concluded in upthread discussion that for Bitcoin the easier attack vectors are regulation (since anonymity can easily be universally broken ex post facto with coin taint) and taking control over the few large pools.
Designing defenses against the 51% attacks is more relevant to the proposed altcoin that would be more impervious to regulation and pool centralization.