Ok so some of the badges I was thinking about that could replace the importance of the marksman badges would be:
1) Raid leader badge: (Probably the most important due to the fact if someone can do this properly they will need to know just about every aspect of the game) requirements: be able to organize a complete CAG raid team without assistance from leadership. Know what is necessary for each/every raid and ensure every member has the requirements before starting the raid. Be able to complete each/every raid in a timely manner for grind runs or during training runs be able to effectively teach each part of the raid. ( I would not be even close to obtaining this as of right now due to little experience with the new raid and its increased complexity compared to all raids before it)
2) Quest Expert (needs better name): has completed all story quests which includes all game content minus rotating faction quests (the daily revolving quests you get at the reef or tower because they are self explanatory)
3) Quest Master: (All the above) is able to help other members with all quests including all exotic quests (must be able to help with the fastest possible way to get all quests completed; an example of this would be knowing the best area to farm for a quest requirement). This could easily be checked by having them run a new member/someone who needs the quest done for the qualification. (Probably require an NCO/someone already with the badge to accompany them)
(During a night strike if all members die and can't revive each other it kicks you back into space making you start from the beginning)
4) Night Strike badge: be able to complete Night strike without dieing and atleast 50 kills in full CAG team (teammates are not allowed to backpack people for this badge; meaning they can't sit back and just revive the other 2 while they clear the strike)
5) Night strike Army of One: be able to complete the night strike all by yourself with atleast 100 kills (kill quota is so that they can't just cheese it)
6) Raid warrior badge: obtain the highest possible Light score which as far as I know can only be done with completing the raid several times. (This is kind of like the army PT expert badge and they lose the badge 14 days after the Light ceiling is raised)
7) Exotic hoarder: obtain Exotic pieces of gear in the game (badge is lost 30 days after new exotics are released) for one class of character.
8) King Midas: Obtain "EVERY" exotic for all 3 character classes. (That's a lot of work)
9) Crucible marksman: Maintain a K/D ratio of (I'm not sure what these numbers should be because I'm not a big PvP guy on this game)
10) Crucible sharpshooter: same as above but harder to obtain
11) Crucible Expert: same as above but much harder
(I was thinking of it this way with overall K/D due to not everyone wanting to play crucible in this game and would not require an additional CaG teammate to watch them obtain this)
(As for PvE marksmanship badge requirements if deemed necessary: Nightfall strikes "ONLY" and should be based on speed of completion and not actual kills due to the amount of variables between the strikes. There should already be stats on the Destiney website the fastest completion times per individual Night strike that we could easily create badge requirements based on the strikes worldwide best times. (Obviously this will be a team effort instead of individual and the team would need to be tracked so that any other teams cannot have more than one person on the team can have a higher badge than the other 2. This will not only help new members make new teams to practice with but will also ensure 2 good/great players aren't backpacking every new member to get them the badge. After writing this I think this should be the substitute for the marksmanship badges and be called something else.
(wrote this on zero sleep and after driving for 8 hours so please excuse mistakes like me calling something that has a different name and grammar)
I have a few other ideas that can be added or substituted but I wanted to see your thoughts on these so I can adjust fire or further build out what is here with any CaG requirements I'm missing.