Definitely agree that college kids have more opportunities than new grads though to meet people. I think the matching idea (tinder/let's date) is a good one, but like you I noticed the problem seems to be that girls don't actually use it - which is critical since otherwise nothing happens.
Never got a chance to run the checkit experiment because I ended up graduated early to move out here for a job. I do think meeting people out (at bars and things) is critical and the dating sites now don't take advantage of that - the check into places idea.
Dating sites set the bar low for messaging which contributes to the over messaging problem, there is a high social barrier to go up and talk to someone or ask someone out in person. The social barrier is actually a good thing because it means that if you go and talk/ask you already have a large advantage since most people were already self selected out. I think something that helps break the ice or helps with this meeting process in a specific place would be valuable. Otherwise I think most dating websites are shitty for heterosexual men in their early to mid twenties.