It basically can't be done because of budget constraints. People complain about the first AVP not having enough predators or aliens... budget constraints. People complain that it was set on earth in the modern day... budget constraints. People complain that too many practical effects were used, reducing the fights to extreme close-ups... BUDGET CONSTRAINTS. The movie was pretty awesome, I thought, especially considering what they had to work with.
Seriously guys, it's going to take something HUGE for them to ever be willing to shell out for a futuristic AVP rife with special effects.