I'm a little leery of the "having more kids just to make someone happy" statement. Maybe you were slightly tongue in cheek but more kids are definitely something to be 100% sure on for yourself. Don't do it for someone else.
I was a divorced mom with kid for awhile (now re-married). Dating is brutal. But I think blending families is pretty do-able as long as everyone is mature and puts a high importance on (all) the kids emotional needs.
That being said my kid was only 2 when her step-dad came into her life. So in a way it's easier because he's just always been in her life as a father figure.
ETA: He's also a Canucks fan. Nobody's perfect.