Honestly, if they remade (remastered) every cod from cod 4 to Mw3 I personally would buy it in a heartbeat. Those games were life let me tell you. a 1080p WAW running at 60FPS... oh lawdy Jesus save me now..

I was thinking about this the other day and this is how I think it should be IMO if they ever did do it.

All 3 Modern Warfare games remastered at 1080p 60FPS.
Bonus game combining the MP of all three games.

Breakdown

Call of Duty 4
Original Campaign & Multiplayer of CoD4 including maps, weapons, perks, kill streaks and its original rank system only.

Modern Warfare 2
Original Campaign, Co-op & Multiplayer of MW2 including maps, weapons, perks, kill streaks and its original rank system only.

Modern Warfare 3
Original Campaign, Co-op & Multiplayer of MW3 including maps, weapons, perks, kill streaks and its original rank system only.

Bonus Game
This combines the the multiplayer maps, weapons, perks and kill streaks from all three games into one.
Any duplicated kill streaks like UAV could just be put into one UAV kill streak and the same for some perks like Stopping Power.
All of the game modes from the three games could be played but any duplicates like TDM could be put into one TDM game mode.
All camos and attachments for the guns could be used without removing any as for example the COD4 gold camo and MW3 gold camo look different.

IMO this is how I would want it as it would benefit all of the people that previously played all three games. Some people would just want to be able to play the original CoD4 multiplayer on its own and some people would just want to play the Bonus combination of all three games. This way every one gets a choice of what game they want play.

I could go into more detail but im just keeping it simple as this is only a reply to the thread. If I had of made this thread then I would have gone into more detail.