So who the heck would want to play an Angel that costs you 3BBWW and blows up all lands? People can be mean, that’s why.
Land destruction is one of the most hated archetypes in all of Magic the Gathering. Since there are ways to get your lands back, such as with Faith’s Reward, or make them indestructible, like with Soul of New Phyrexia, it can be awfully one sided. Also in Commander, some decks can live through land destruction better than others, especially with effects like those mentioned before.
Also, there are Magic players out there that simply love to collect Angels, so there’s always some demand for Angels even if they aren’t good. Desolation Angel isn’t so much good as it is crippling. But in the right deck, it can shut down a potential end-game, and that’s why it’s so strongly desired.
If you have any non-foil copies, it may be best to just hold onto them. If you have foil copies, unless you can get close to the full retail price for them, it’s best to hold them as well. It’s hard to see them reprinting this card, and even if they do, it probably won’t be in a set that also has foils.