Music WI: David Lee Roth stays in Van Halen

What if all the stuff that led to DLR leaving Van Halen in 1985 (dislike of synthesizers, wanting to be a movie star, etc) had'nt happened and dave stayed in Van Halen to this day? Would they have stayed popular? Would 5150 and the following albums have a more "raw" sound? Would they be victims of grunge?
 
Even if they had stayed together then, even for a few more years, I think they would still break up later on. Eddie's and Dave's massive egos will get in the way, it's just a matter of when.
 
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