In the words of the great Encyclopedia Galactica: DON'T PANIC
Did the "possible 51% attack" originate form a regular mining pool? I somehow doubt that. Prematurely blaming regular pools is IMO a bad move and definitely not good Karma. Isn't it much more likely that the attack was coming from an external actor, rather than the existing Karma mining community? What if it is related to the 1.5+ GH/s Nethash that were unaccounted for last week? Was it even an attack on the regular network or rather aimed at Mintpal directly? I'd like to see some facts before we rush to conclusions and point fingers.
If it was indeed a 51% attack, it is pretty much the scenario I and others were warning about in April. Because of the new ASICs several GH/s of mining power are suddenly at the whim of a few select people. Moving our existing hashrate to P2Pools doesn't protect from that. P2Pool is a tiny piece in the puzzle of securing the network at best.
Another piece would be if the community and/or LLC joined the game and secured the network by aquiring additional mining power, either through renting rigs or purchasing ASICs. This was already suggested as an idea on the Karmashares forums IIRC.
In the interest of not getting this whole mining/algo/PoS discussion started again, I'll just shut up now. The team will work it out, I trust them to do whatever is best for Karma.