NO, NO, NO, NO, NO!!!! I vote keep the nap. All kids go through phases. I have an almost 4 year old and a 5 year old. They go to daycare and have naptime everyday. They don't always nap, but the rest (and routine) is good. They don't like to nap for me on the weekends, but I still make them have quiet time and lay down in their beds. Sometimes they sleep, sometimes they don't, but at least I have a few minutes to myself (selfish I know, but sometimes mommy needs a nap too).
With Summer coming, one thing you could do is change the routine some. Maybe change bathtime to at night and play outside during the time you would normally do bathtime. That way he will be tired for naptime and the bath may settle him down for bed (plus be clean).
If he doesn't get a nap everyday, don't worry. Kids will sleep if they are tired. Have fun with him, he will nap less as he gets older, but leave the option in to have a nap because there will be days you need it more than him.
Good luck.