Just wanted to share the experience of a somewhat casual gym battler, that is when I go battling I would hold only one gym, most I have ever held is 3.
Under the old system, I usually just take down/prestige a gym to claim my 10 coins. Gyms were also mostly occupied by level 30+ which almost always places me at the bottom, so I would put funny things like my 30 CP Alakazam cause I knew I wouldn't survive anyway .
Now given that I was used to getting 10 coins at a time, you can understand my excitement when my Snorlax came back with 50 coins!
So this got me thinking, this new gym system seems more accessible for lower levels, which does correspond with the increased number of level 20s I'm seeing.
As a slight side note, it also rewards depth rather than coverage. What I mean by this is that it seems better to focus your efforts on a few gyms rather than a dozen gyms.
Just some musings from my excitement today