Do you think caucus is an archaic concept in this day and age? Why do some states have advanced and simple, user-friendly voting systems in place and why some states are in older system? Is there no central neutral body? like Election commission or something?
If all your state cares about is voter participation, then a primary does that. More people will come to a polling place, wait in line for a time, cast a vote, and leave. Nevada currently has a caucus, and you can treat it the same way if you want. You can come, wait, get a ballot, mark your choice, and leave. You don't have to stay, but a caucus is like a mini convention, a gathering of your neighborhood, except there is no one there from that offensive opposing party. Donald Trump was the overwhelming favorite, so there was not much to argue about. The caucus system tends to bring out the more informed, and keep away the less informed... so I like it. My wife and I treat all election days like Holidays... we take the day off and have fun.