Patsy had to have known she wasn't exactly going to be getting anything if she moved to the States. She's over 40, has a thick cockney accent that I doubt she could hide well, and is not a classic beauty. The timing is just totally wrong for her.
That said, I do not miss her on EE when I do watch. Bianca had become such insignificant and extremely grating character by the end that I was happy to see her go.
Janine/Charlie Brooks is a different story though, as she basically carried the show during a really terrible era (which IMO has yet to end). Though, I can't see this new show working out well for her either and doubt she'll get any US roles as well.