David Hayter not returning for ‘Metal Gear Solid V’, Kojima never asked him

[TheKoreanGuy]

Deyon said:
In MGS4 Big Boss was voiced by a different actor and Solid Snake would probably be too young to have David hayters voice.

That's the only reason i can think of.

You play as Solid Snake in this game though. There really is no reason why David Hayter shouldn't be in this.