Rogaine is sooo not worth it. A ton of money/time just to save a little hair. Plus the sexual side affects. If it's gonna go, it's gonna go, just ask Patrick Stewart. I'm sure they can just go shatner style with a riker wig if they want him to play the character again, or just let the character age as well.
I kinda like him better with the gut in seasons 3+ than his season 1 appearance.