[NeverlessWonder]

I don't think it's as serious as all that. Yeah, it's been along time since there's been a mini-game made by TDF (Hobo Heights, Tremors, Cat n Mouse) but there's been a lot more games made since then, than just Duck Hunt.

Teamwerks Arena, Jenga Tower, Rock Wall, UNSC Range, Devinish's Defrag jump maps, Destruction Derby, Viceball, Brute Burnout, Tragectory Range, Gooseball, Leapfrog, Cannon Fodder, Sit on you, Dr. Spy.....

There's a lot of games out there.
I can see the concern; that it seems like the major interest nowadays is in geomerged/interlocked competitive maps, but there's really more out there than just that. Besides, there was a time when it seemed all the interest was in minigames and infection, and the competitive maps were ignored.

So just because TDF was away, doesn't mean that all the good gametypes are gone. You just have to look.