Most likely outcomes:
Conversions to emo
Slit wrists
Boredom
User-Database shrinks profusely
Extreme ammount of servers die out
Noone plays
Boredom
People need to find a new game
Forums left desolate
Boredom
Less money for Badspot
Boredom
Useless add-ons and bad maps
Boredom
Boredom
N00b populous grows
Boredom
Boredom
Boredom
...
Yeah, exactly.
Boredom
Throwing monitors
Make 50 more Blocklands
Swearing at their mothers
Boredom
Make 50 more mods for v0002
Hang self
Play Rakion
Masturbate
Boredom
Spam Bleh's forums
Spam bl.us forums
Off-topic some more lolcats and shoop-da-whoop
Eat pork
Kill Kork
Make Kork carry an AK-47 (yeah Josh is a weirdo...)
Run around naked in AoT
'Pwn noobs' in CoD4
Yell at Badspot because Blockland died (why? I dunno...)
Yell at Mocheeze because Blockland died (Worse than the one above)
Ask why RTB costs $20 (which it doesn't)
Boredom
Boredom
Draw Wedge a new face
Make lists of things people would do if Blockland died