I used a lot of airlifts as well, also 100-army-bonuses for two Major Cities. These are not necessary for the Wasteland Style. In this example abandons are 2000%.
I do not consider semi-permanent walls a problem. Generally only the winner that already control most of the map break one wall to eliminate the enemy. Walls are possible to be broken but they are not something you are supposed to be able to break with one full turn's income. Almost all walls are intact at the end of a game.
This particular example is funny because finally one guy can hide inside a cave surrounded entirely by abandons from both sides (so this weird situation is not even necessarily intentionally caused by any player) before the game ends.
By the way, the record for the highest abandon in a game I see is 16000+ which is very rare.
P.S. The reason I call these abandon/blockade stacks walls is that they are generally not just present in a few isolated places but instead form several connected walls that radically change the map. For example some walls may surround a big bonus completely, some walls may close off almost all contact with an opponent, some huge walls may even extend from one side of a map to another. So they are indeed what I call them..walls.
Edited 12/16/2015 06:16:35