In my mind, for long term, yes. If I'm to worry about the reward scheme, I'd worry more about the reward coming down too fast if this becomes popular.

Apart from being the first N-change coin, YACoin's POW reward scheme is very much a special feature that shouldn't be touched lightly. The reward dependence on hashrate, together with the N-change schedule give the reward plan something like a fat middle period IF mining capital investment remains the same. Obviously, that mining investment depends on popularity which is hard to predict. Still, this is quite an interesting feature since the overwhelming majority of coins have rewards that never increase. Most go way down in just a few years, and in recent months, the fashion is to have the rewards go way down in just a few months, or weeks, or go to 0 from the start. The market is totally flooded with coins that hand a tremendous advantage to people who grab some near the beginning. I doubt joining that very long list of coins will significantly improve YACoin's long term prospect.