Based on your experience, which is the role played by each one of those standards, is SAML going to the be replaced from OpenID?, or we will see those standards fighting on the market for long time.
Based on my last experience, ti is important to identify the battlefield on which to evaluate the use of these protocols.
SAML was born when the mobile apps were not yet the market trend. Adn SAML in this case seems not the way to go.
Take a look at this doc: https://www.mutuallyhuman.com/blog/2013/05/09/choosing-an-sso-strategy-saml-vs-oauth2/
And now it's the API era ... so OAuth2 it's your time !
Instead if we have to implement SSO for enterprise apps most probably we can go for SAML.
it will be a long battle :-)