Right now, for Stevie, it's all about momentum. If Fleetwood Mac can have an album out this time next year that's great. However if they wait 5 years(The Dance until Say You Will) that creative momentum will be lost as will the desire of FM/Stevie fans and the buying public in general.
I do, though, find it strange that Stevie and Lindsey have remained busy since Say You Will. I don't know exactly what Mick and John have been doing.
They should definitely bring in a producer and consider adding a new member
or something along those lines.
And since this is the Fleetwood Mac forum and not the Stevie forum...If Mick, John, and Lindsey want another Fleetwood Mac they should do it, regardless of what Stevie wants.