Does it happen,you asked.
I belive it does.
There is such thing as being swept away by someone and feeling the butterflyes.....but... then in a while the reality kicks in

And since today we are no longer preasured as much to have a familly as soon as possible(..parents demanding grankids excluded

) and like you said- our chances are no longer limited to the place you can reach by foot in one day and not even metiong the fast tempo of living and the preasure to be successful at the youngest age possible... and yes, all the "perfect" people with "perfect" bodies and lives...What a confusion!
I think we all suffer from a lack of patience and toleration when being in a relationship. When it comes to a problem - and i always does, sooner or later- we rather run then solve it. Find someone else. There are a lot of other fishes in the sea, right? The "beauty" of bigger market... And internet is perfect that way- you can move faster from one person to another, not really knowing what you might missed though..
But I still belive love has nothing to do with so called perfection. I am one of the lucky ones who have experienced love and it has nothing to do with six-pack and big wallet. At least not in my case
In fact- i find that more intimidateing couse im more aware of my imperfection (..here we are, the preasure of being perfect again..

lol) But you get my point.
I do wonder somtimes though..- why internet, why look here and not around the block..?
And I can help thinking maybe I just dont want to find it jet adn look around what is out there....
or maybe is it really just that I get soft in the knees hearing forign accent