I'm not sure it will keep getting better. It'll lose floral elements and become very dry and eventually thin. Like an old wine. Not necessarily worse, but every beverage has its peak.
Still, no point in not hanging on to some. In about 1996, some friends and I drank a bottle of Dom Perignon 1964 that we had found (yeah, I know). Everyone told us it should be crap, but it was a really nice bottle of bubbly. An 100 year old Burgundy is some of the world's more revered wine. Honey has amazing keeping power. So, you never know what it'll do, and as long as it isn't overly oxidized and is stored well it won't get worse fast
The only alternative is to crack a bottle open with your son tonight!
As far as you not liking it, if you aren't sure that you like mead, then it could be as simple as that. Mead is an interesting flavor...more brawny than a white wine, especially straight meads. I think they really benefit from the addition of some acidic fruit. It definitely helps them ferment better.
When was the last time you tasted it and how was it then?