They have what you're asking for. It's called Fan Axxess. It's been around since SVR2011. It gets you all the DLC except for the pre-order bonuses, and it costs less than it would to buy everything individually.
If you buy Fan Axxess now you get the first DLC Pack now and the remaining content when it is released at no extra cost. Plus you get Goldust and DDP, which is the only way to get them. I bought it on Friday and am very glad I did. I'm happy with the first pack alone and can't wait for the other 2 wrestler packs, moves and titles. Buy it.