As pointed out by slazaro, this is incorrect. A decrease in usage and/or a change in the market size potentially lowers penetration as a percentage, which could

As pointed out by slazaro, this is incorrect. A decrease in usage and/or a change in the market size potentially lowers penetration as a percentage, which could enable it to double again. As stated, it's either ambiguous or false. If it actually means penetration will never again double from the peak percentage it reached which was >=50%, it's trivial and uninteresting... if it doesn't imply that, then yeah, it's just incorrect.