If Dalton had taken over for Moore after FYEO he would have been a good age for a hypothetical CR movie. Theres a lot of "what ifs" about Dalton as Bond. Maybe more than any other actor that got it since he was considered for the role at various points before he was finally locked in or his Bond films got stalled.
I've often wondered what it would have been been like if He'd taken the role earlier. or if Connery had stayed for OHMSS. Or if Brosnan had been allowed to do TLD. Or if Moore had done DAF.

I feel like Dalton's short tenure is the biggest missed opportunity. My imagination runs wild.
The world wasn't used to or ready for his portrayal after Moore's long run as Bond but I think what Dalton did needed to be done. Bond needed to change with the times (without loosing his unique charm and fun of course). It wasn't the 60's or the 70's anymore and new types of film heroes were rising in the 80's. I certainly couldn't have taken Moore seriously in the role the late 80s and
it would have been silly to go with someone that was a Moore clone.
I suppose Brosnan would have been the ideal choice since he had a lot of charm but to be honest I always felt Brosnan was a wee bit too young at that point.