Isn't the whole point of using decentralized computing power to pool resources for the common good? To defend against the powerful by uniting the rest? To secure transaction processing by building a network of individuals?
The point of crypto-currency is to defend. That's how it is built. That's how it is succeeding. Growth, community building, and dedication are the ways to defend.
There are no magical answers, that's why all coins have the same one. The community is stronger than the attacker. That is the only defence P2P has and the reason for its existence.
I really hope the community is stronger than a possible attacker. But is it? Litecoin hashrate is 28 Gh/s right now. DGC hardly 1, while DGC has the largest market cap of any POW scrypt coin behind litecoin (safe), and feathercoin (already successfully attacked). Even a small fish ltc pool owner could attack DGC for breakfast right now, for totally unreasonable, or reasonable motivations such as protecting ltc from serious competition in the future. Bitcoin is safe (sha256), Litecoin is safe (too high hash rate), Feathercoin is toast, all other coins are either sha256 or Proof of Stake (Novacoin, PPC...) I know this sounds like FUD, but I'd be really happy if there were measures of protecting against a 51% attack. DGC would likely be the next target, and I don't see how any ltc pool operator would suffer from that (if he does ltc a favor with it), or even be found out to be behind such an attack.
1 Bitcoin $ 1,129,886,759 $ 98.95 11,418,775 BTC +3.55 %
2 Litecoin $ 58,364,578 $ 3.00 19,466,654 LTC +5.42 %
3 Namecoin $ 3,338,505 $ 0.56 6,014,143 NMC +4.43 %
4 PPCoin $ 2,973,268 $ 0.15 19,639,354 PPC -6.23 %
5 Novacoin $ 1,282,148 $ 4.14 309,767 NVC +3.17 %
6 Feathercoin $ 881,039 $ 0.087 10,118,050 FTC +5.87 %
7 Terracoin $ 565,937 $ 0.18 3,195,210 TRC +12.03 %
8 Devcoin $ 333,066 $ 6.8e-05 4,878,270,050 DVC -3.29 %
9 Freicoin $ 266,730 $ 0.012 22,644,509 FRC +5.43 %
10 Digitalcoin $ 205,112 $ 0.042 4,848,386 DGC -25.74 %