At low AIPs, the nerf does make things easier. At high AIPs, the "nerf" can make things MUCH more difficult. More precisely, once the AIP exceeds something around 3 * AIPNeededForExtraEnclave, things will be harder than before. The 3 comes from the fact that the new enclaves only hold 30% as many ships. However, since each enclave has its own health and weaponry, I am counting that towards the remaining 3% "extra firepower".
EDIT: After reviewing the previous posts, the AIPNeededForExtraEnclave is currently at 50, which seems a little low. At 150 AIP, the enclaves become just about as hard as before, and get worse from there. In most games I've seen, it doesn't take too long for 150 AIP to be reached. Anyone want to weigh in on this?