Prabhupada had such an ambitious plan to change the world, because harer nam harer nama harer nama eva kevalam: "Harinama is the only way for spiritual perfection in this age." But Prabhupada saw that people don't have time, nor the inclination. This modern society makes the people into demons. So this simple life is very conducive for spiritual advancement.
Lecture on "Living without Electricity" – Salem – 26th Nov'07
The more one makes spiritual advancement, one feels humble and as one's devotion is superficial that much he feels that he is a great devotee.
Advancement in Krishna Consciousness depends on attitude of the follower.
Spiritual advancement without mind control is simply an illusion.
To make spiritual advancement we have to be very attentive in our dealings with our mind.
Our advancement is not because of our endeavor but Krishna's mercy, which is withdrawn when He sees pride within us.