Wow. This is pretty sobering. After God's people quit remembering what He had already done, they quit waiting for Him to come through and took matters into their own hands. This led to grumbling, and sin and lusting and death and loss of their promised land and their lives. It even led to them sacrificing their own children!
If we don't wait for God (and this isn't easy toward the end. It might look like He isn't coming through but hold on anyway), we might lose everything. Or we might just make do while never realizing what we actually lost -- seeing God do some mighty miracles on our behalf.
So, tell God you will wait for Him. Tell Him you are standing in place and you aren't going to budge, not one inch. Keep waiting. Keep waiting. Keep waiting. He is never late. He is always on time. He will always come through.