What "unbreakable" baseball record will be broken?

[Arkham House]

Everybody "knew" that no one could even approach 714 home runs...or Ruth's .847 slugging average...or Johnson's 3497 strikeouts...or, of course, Lou Gehrig's 2130 consecutive games played...and I still wonder if I hallucinated seeing *that* one broken... So: which "unbreakable" record is vulnerable...? I think just about every record is capable of being broken--the game can change very quickly, and who knows? One I'd bet the farm on--Nolan Ryan's 5700-odd career strikeouts. Some other horse will come along and pitch to 45, and eclipse it...any other guesses?