As long as it doesn't take inventory space (like the borg neural processors do), it's fine. But i really don't like having to keep all these collectible items because inventory space is expensive and very limited, even for lifers.
I don't mind having 10-15 different currencies as long as it makes sense and goes into the assets tab.
There is one surefire method to get gamers to play new content. It's not a method Cryptic tries very often, but it has always worked with other games.
Make the new content fun to play!
I know this kind of thinking is radical, subversive and even dangerous, but I think it's worth a try.
People will always play the most profitable content at some point, just to get their stuff. If there's only one type of marks many nerfs will be required, including on STF rewards. And gods know it will bring a lot of rants on the forums. Cryptic doesn't need to open this Pandora's box again.
Really, new content was cool in season 7. And the current design choice has also a lot of advantages, they can balance finely the rewards and be generous in specific cases (STFs, fleet missions, eppohs). I don't want to see a massive nerf across the board just to appease a group of people who don't like having 7 lines instead of 1 in their asset tab.
I just want to see account wide reputation, where the reputation bars are shared account wide, with reputation gains being shared account wide, while projects for gear/consumables remain per character.