While I haven't followed his art since the beginning, since I kinda just moved into this thread, I find it enjoyable. Sometimes it's just charming, others it gets me to chuckle a little, and sometimes it actually points out something I hadn't thought of (his last one you posted, the second row, first column, thought that was funny).
Overall, I'd enjoy seeing more. Like I said, what he does is simple, but pretty cool and funny as well. But if he feels it's best to stop, for whatever reason, then he should. He knows what's best.