Aye, perhaps it just wouldn't work right, even with all the technology the aliens have.. It's just easier to build things that simply blow up bases rather than build things that take away effective means of defense or offense. It just would have been interesting to see in the late stages of the game, the most commonly used offenses or defenses be rendered unusable, and would cause the player to need to use different strategies nearer the end.. But, maybe that's a bit off topic. It is pretty crazy to create a way to counter the way the players keep using. It makes much more sense for humans to create ways to counter what the aliens are doing, since they're the ones with the more advanced technologies.
My suggestion originally was, given enough time, if the humans only used one way to attack or defend, to 'remove this one way, but leave other ways open. This would require the humans to change strategies eventually to keep defending and attacking as time went on, and this would be different for each player.
In other words, if one player favoured using sniper rifles all the time, to remove that.
If a different player used explosives mainly, to remove that.
If another ... oh wait... there aren't many other ways to effectively stop aliens.
Mmm, I guess it's a bad idea. There really aren't many different ways to attack the aliens to remove near the end of the game, and encourage a different tactic. Ah well. Weird thoughts while they lasted I guess. I guess it's a bad idea to research alien ways to stop specific attacks based on what certain humans might come up with, to encourage players to come up with completely different ways to fighting in the end. I guess we encourage one straight forward way of fighting..
Aka: X-Force
Sorry, X-force way of thinking. I've been playing that game too much lately, and my thoughts have obviously gone that way.