Based on my playstyle, I haven't run out of charges yet! I am not a big WW collector, so my motivations are simply to complete activities. I usually am in the Campaign for the purposes of fulfilling the activities, and I will Explore until my wolves run out of stamina, and then I'll go elsewhere until the "Feed Wolves" activity shows up so that it makes feeding their greedy butts worth it. ꉂ(≧▽≦)
For me, the way LW has kept my attention is the fact that there are so many activities to do outside the Campaign. The previous pet site I was on, Flight Rising, only really had their equivalent of the Campaign for grinding and money-making / food obtainment / creature leveling purposes and I got burnt out real fast. So having LW de-centralize the Campaign as part of their overall game design is actually something I really appreciate. I get that it's not for everyone, but I am happy in this niche!
I also joined about 10 months ago and have been playing pretty casually the whole time, and have gotten 34,082 scenarios done, and 44 of the 50 Campaign achievements so I do believe it is doable! I will agree with others that the upcoming Seasonal will be a real test, as I was certainly in the Campaign a lot more to get tickets then. That's when we should be getting our next bi-monthly update as well, so I am hopefully that adjustments may be incoming.