April never worked for me as a marital partner for Bobby -- they had to change her character too much, so it all felt so contrived. But Katzman "liked" Sheree, so that was that,
Frankly, April seems to me like one of those DALLAS female stalkers who dies in the end. And she did indeed die in Paris, but she should have been shot by the gendarme while chasing Bobby down with a butcher knife, enraged over his French wedding to Tracey Lawton (Tracey was an odd one. but I believed her more as a potential Ewing spouse -- although, naturally, she wouldn't last long herself).
Everybody always thinks I'm crazy for this, but I still say everyone should have cleared the path for Afton to become final "Mrs Bobby James Ewing" at the end, even though the two characters had few scenes together during the entire series and no relationship.
But I just smell it. And I would much prefer Afton living at Southfork -- the inevitable tensions with Sue Ellen, the jealousy from Cliff -- for TNT's nuDALLAS as opposed to that smug and truly desperate housewife, Ann Ryland.