We should all have "Big, Hairy, Audacious Goals" (BHAGs), but we should also be able to anticipate the challenges to achieving those goals.
It's good to set SMART goals, but the more ambitious a goal, the harder it is to set a goal that's SPECIFIC, ACHIEVABLE, and TIME-BOUND.
Human beings are not very good at thinking about the future. We tend to under-value future benefits and over-value present benefits, and we also tend to give our future selves too much to do.
Time management is hard! First, we often focus on "urgent" things at the expense of what really matters. Second, we usually don't control how we spend all our time.