Even if they publish mod tools and dedicated servers it would take too much time and effort to remove all the crap they implemented in last several editions and make a decent competitive mod. Upon which time they would probably release the next edition of game and stop caring about this one.
People should just face Activision made CoD series into casual public fun for 15 year old kids.
If COD PC ever wants to relive the days of 2008/2009 we have to get used to the new games that gets released and adapt to every new release. But that'll never happen because you can never maintain a competitive scene when there's a new release every year and one is more flawed than the other.