This question can be read two ways for me. 1.) If love disappeared, how would the world be. 2.) If there was never any love to begin with, how would the world be.

For the first, I can't really see life without love. Love...love is everything. Love has so many different forms. I mean how many times did you get excited about something today? If you had a bad day, how many times did you wish to be doing something else today? Those are forms of love. Weaker forms than the love of a person, but love none the less. Love has to be around. If not, then, it just would be awkward.

For the second, how will you truly ever know? You base your responses off your own experiences. So you truly can never know what a world would be like if love never existed.

No love means war would rampage since everyone would hate each other. no love means no future generation unless people would be willing to have a kid with someone they hate...which is unlikely. so that means sooner or later a world with no love would be a world with no humans. which at least will give earth time to recover from what humans did to it.

No love in this world?

Simple. We still have our friends and families. Although love is necessary because if you have love inside your heart, your world will get vaster and better. Love is an ingredient for relationships, even for friendships! ;)
If you think about this, what will happen if there's no love in this world of oxymorons? We wouldn't exist because our parents did not make us born.

Simple, right? :)

If there is no love. we can't see a couple -> A marriage -> Children , Meanthere will be no human...

If there is no love the world will be filled of "hatred" that may result to quarell, arguement or even war.