Board Thread:The Flash discussions/@comment-9346948-20160420004341/@comment-25322628-20160421073840

Maybe the Speed Force is still inside him, just recharging or Barry needs to believe that it still resides in him.

Also, if Zoom increases in speed, I doubt that it would save him. It's like with The Power from The Covenant; Chase Collins/Pope has The Power in him and he's under the influence of its addictive nature and desires more of it, despite him not really needing more. The Power ages him prematurely, taking bits of his life until he's reduced to a sickly old man from overuse and abuse. It's his body that wares off, not the Speed Force.