Haha this is liike the Bueller midlife crisis!
I doubt they will make a sequel, it's hard to follow that up
I've thought about it on more than one occasion. Imagine Ferris getting so caught up in being a working stiff and a whipped husband that he gets as uptight as Cameron, and Cameron becoming some kind of dot-com millionaire and living easy... Then HE'D be the one making Ferris loosen up and live a little by stealing him out for a day away from work.
That would be so cool!!! I'd also like him to meet up with his girlfriend from the first movie (I always thought she was gorgeous!!!), for whatever reason they split as I think she was to nice to turn him into a whipped husband so he'd have to've married someone else. Also, remember her last line in the film?, "He's going to marry me".
So at the end of his "Day Off", I'd love to see Ferris, quit his job, go into partnership with Cameron, (Something that he'd been offered but refused due to jealousy perhaps? which led to a distance in their friendship?) And leaves his domineering wife to rekindle his romance with the recently divorced Sloane.