Would easy-access suicide and societal encouragement of suicide as an escape-route create a utopia of happines?

Suicide might eliminate unhappiness and misery for those who choose it, but it creates a living hell for those forced to live with the consequences. I also take issue with your ertion regarding serfdom and slavery. There are many reasons to live regardless of your situation. I would suggest Viktor Frankl's book as a starting point (Man's Search for Meaning.)