Yeah, I'd buy it...unless it was basically Dave Mason fronting the band
Seriously, I think LB is at the point now where he knows he can make more $ with FM than he ever could alone (a slow but obvious realization?) so possibly he is more inclined to be on a new FM record than Stevie. That said, I think Sevie would do another record--with or wthout Chris. She's a tour hound and the lure of good $ wouldn't hurt.
I would love all three of them o be back for a studio record. Period. Take or leave a tour. Just get them to make some damn good music, which thankfully they're all still doing in various configurations.